# The LearningOnline Network with CAPA
# Tags Default Definition Module 
#
# $Id: londefdef.pm,v 1.150 2003/06/30 19:26:36 sakharuk Exp $
# 
#
# Copyright Michigan State University Board of Trustees
#
# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
#
# LON-CAPA is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# LON-CAPA is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with LON-CAPA; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#
# /home/httpd/html/adm/gpl.txt
#
# http://www.lon-capa.org/
#
# Copyright for TtHfunc and TtMfunc by Ian Hutchinson. 
# TtHfunc and TtMfunc (the "Code") may be compiled and linked into 
# binary executable programs or libraries distributed by the 
# Michigan State University (the "Licensee"), but any binaries so 
# distributed are hereby licensed only for use in the context
# of a program or computational system for which the Licensee is the 
# primary author or distributor, and which performs substantial 
# additional tasks beyond the translation of (La)TeX into HTML.
# The C source of the Code may not be distributed by the Licensee
# to any other parties under any circumstances.
#
#
# last modified 06/26/00 by Alexander Sakharuk
# 11/6,11/30,02/01/01,5/4 Gerd Kortemeyer
# 01/18 Alex Sakharuk

package Apache::londefdef; 

use Apache::lonnet();
use strict;
use Apache::lonxml;
use Apache::File();
use Image::Magick;
use Apache::lonmenu();
use Apache::lonmeta();

BEGIN {

    &Apache::lonxml::register('Apache::londefdef',('a','abbr','acronym','accessrule','address','allow','applet','area','b','base','basefont','bgo','bgsound','big','blink','blockquote','blankspace','body','br','button','caption','center','cite','code','col','colgroup','dd','del','dfn','dir','div','dl','dt','em','embed','externallink','fieldset','font','form','frame','frameset','h1','h2','h3','h4','h5','h6','head','hr','html','i','iframe','img','input','ins','insert','isindex','kbd','keygen','label','layer','legend','li','link','m','map','marquee','menu','meta','multicol','nobr','noembed','noframes','nolayer','noscript','object','ol','optgroup','option','output','p','param','pre','q','s','samp','select','server','small','spacer','span','strike','strong','sub','sup','table','tbody','td','textarea','tfoot','th','thead','title','tr','tt','tthoption','u','ul','var','wbr','hideweboutput'));

}

#======================= TAG SUBROUTINES =====================
#-- <output>
sub start_output {
    my ($target) = @_;
    if ($target eq 'meta') { $Apache::lonxml::metamode--; }
    return '';
}
sub end_output {
    my ($target) = @_;
    if ($target eq 'meta') { $Apache::lonxml::metamode++; }
    return '';
}
#-- <m> tag
sub start_m {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$Apache::lonxml::prevent_entity_encode++;
	my $inside = &Apache::lonxml::get_all_text_unbalanced("/m",$parser);
	$inside ='\\documentstyle{article}'.$inside;
	&Apache::lonxml::debug("M is starting with:$inside:");
	my $eval=&Apache::lonxml::get_param('eval',$parstack,$safeeval);
	if ($eval eq 'on') {
	    $inside=&Apache::run::evaluate($inside,$safeeval,$$parstack[-1]);
	    #&Apache::lonxml::debug("M is evaulated to:$inside:");
	}
	$currentstring = &Apache::lontexconvert::converted(\$inside);
	if ($Apache::lontexconvert::errorstring) {
	    &Apache::lonxml::warning("tth error: ".
				     $Apache::lontexconvert::errorstring);
	    $Apache::lontexconvert::errorstring='';
	}
	#&Apache::lonxml::debug("M is ends with:$currentstring:");
    } elsif ($target eq 'tex') {
	$currentstring = &Apache::lonxml::get_all_text_unbalanced("/m",$parser);
	if ($currentstring=~/^(\s*\\\\\s*)*$/) {$currentstring = ' \vskip 0 mm ';}
    } else {
	my $inside = &Apache::lonxml::get_all_text_unbalanced("/m",$parser);
    }
    return $currentstring;
}

sub end_m {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$Apache::lonxml::prevent_entity_encode--;
    } elsif ($target eq 'tex') {
	$currentstring = "";
    } elsif ($target eq 'meta') {
    }
    return $currentstring;
}

sub start_tthoption {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $result;
    if ($target eq 'web') {
	my $inside = &Apache::lonxml::get_all_text("/tthoption",$parser);
	$inside=~s/^\s*//;
	if ($ENV{'browser.mathml'}) {
	    &tth::ttmoptions($inside);
	} else {
	    &tth::tthoptions($inside);
	}
    }
    return $result;
}

sub end_tthoption {
    my ($target,$token) = @_;
    my $result;
    return $result;
}

#-- <html> tag    
sub start_html {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($ENV{'browser.mathml'}) {
	&tth::ttminit();
	if ($ENV{'browser.unicode'}) {
	    &tth::ttmoptions('-L -u1');
	} else {
	    &tth::ttmoptions('-L -u0');
	}
    } else {
	&tth::tthinit();
	if ($ENV{'browser.unicode'}) {
	    &tth::tthoptions('-L -u1');
	} else {
	    &tth::tthoptions('-L -u0');
	}
    }
    if ($target eq 'web') {
	$currentstring = &Apache::lonxml::xmlbegin().
	    &Apache::lonxml::fontsettings();     
    } elsif ($target eq 'tex') {
	@Apache::londefdef::table = ();
	$currentstring .= '\documentclass[letterpaper]{article}'.
                           #'\batchmode'.
                           '\newcommand{\keephidden}[1]{}
                           \renewcommand{\deg}{$^{\circ}$}
                           \usepackage{longtable}
                           \usepackage{textcomp}
                           \usepackage[dvips]{graphicx}
                           \usepackage{epsfig}\usepackage{calc}
\newenvironment{choicelist}{\begin{list}{}{\setlength{\rightmargin}{0in}\setlength{\leftmargin}{0.13in}\setlength{\topsep}{0.05in}\setlength{\itemsep}{0.022in}\setlength{\parsep}{0in}\setlength{\belowdisplayskip}{0.04in}\setlength{\abovedisplayskip}{0.05in}\setlength{\abovedisplayshortskip}{-0.04in}\setlength{\belowdisplayshortskip}{0.04in}}}{\end{list}}';
    }
    return $currentstring;
}

sub end_html {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = &Apache::lonxml::xmlend();
    }
    return $currentstring;
}

#-- <head> tag
sub start_head {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_head {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = &Apache::lonmenu::registerurl(undef,$target).
	    $token->[2];    
    } 
    return $currentstring;
}

#-- <map> tag
sub start_map {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_map {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <select> tag
sub start_select {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_select {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <option> tag
sub start_option {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_option {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <input> tag
sub start_input {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_input {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <textarea> tag
sub start_textarea {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_textarea {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <form> tag
sub start_form {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_form {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <title> tag
sub start_title {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	$currentstring .= '\keephidden{' 
    }
    if ($target eq 'meta') {
	$currentstring='<title>';
	&start_output();
    }
    return $currentstring;
}

sub end_title {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } elsif ($target eq 'tex') {
	$currentstring .= '}';
    }  
    if ($target eq 'meta') {
	&end_output();
	$currentstring='</title>';
    } 
    return $currentstring;
}

#-- <meta> tag
sub start_meta {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	my $args='';
	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
	if ($args eq '') {
	    &Apache::lonxml::get_all_text("/meta",$parser);
	} else {
	    $currentstring = $token->[4];
	}
    } elsif ($target eq 'meta') {
	unless (&Apache::lonxml::get_param
		('http-equiv',$parstack,$safeeval,undef,1)) {
	    my $name=$token->[2]->{'name'};
	    $name=~tr/A-Z/a-z/;
	    $name=~s/\s/\_/gs;
	    $name=~s/\W//gs;
	    if ($name) {
		$currentstring='<'.$name.'>'.
		    &Apache::lonxml::get_param
			('content',$parstack,$safeeval,undef,1).
			'</'.$name.'>';
	    }
	}
    } elsif ($target eq 'tex') {
	&Apache::lonxml::startredirection();
    }
    return $currentstring;
}

sub end_meta {
    my ($target,$token,$tagstack,$parstack,$parser) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	my $args='';
	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
	if ($args ne '') {
	    $currentstring = $token->[4];
	}
    } elsif ($target eq 'tex') {
	$currentstring=&Apache::lonxml::endredirection();
	$currentstring='';
    }
    return $currentstring;
}

# accessrule
sub start_accessrule {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    my $eff=&Apache::lonxml::get_param
	('effect',$parstack,$safeeval,undef,1);
    my $realm=&Apache::lonxml::get_param
	('realm',$parstack,$safeeval,undef,1);
    my $role=&Apache::lonxml::get_param
	('role',$parstack,$safeeval,undef,1);
    $realm=~s/\s+//g;
    $realm=~s/\//\_/g;
    $realm=~s/^\_//;
    $realm=~s/\W/\;/g;
    $role=~s/\s+//g;
    $role=~s/\//\_/g;
    $role=~s/\W/\;/g;
    if ($target eq 'web') {
	my $args='';
	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
	if ($args eq '') {
	    &Apache::lonxml::get_all_text("/accessrule",$parser);
	} else {
	    $currentstring = $token->[4];
	}
    }
    if ($target eq 'meta') {
	$currentstring='<rule>'.$eff.':'.$realm.':'.$role.'</rule>';
    }
    return $currentstring;
}

sub end_accessrule {
    my ($target,$token,$tagstack,$parstack,$parser) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	my $args='';
	if ( $#$parstack > -1 ) { $args=$$parstack[$#$parstack]; }
	if ($args ne '') {
	    $currentstring = $token->[4];
	}
    } 
    return $currentstring;
}

#-- <body> tag
sub start_body {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	if (!$Apache::lonxml::registered) {
	    $currentstring.='<head>'.
		&Apache::lonmenu::registerurl(undef,$target).'</head>';
	}
	my $onLoad='';
	foreach my $key (keys(%{$token->[2]})) {
	    if ($key =~ /^onload$/i) {
		$onLoad.=$token->[2]->{$key}.';';
		delete($token->[2]->{$key});
	    }
	}
	$token->[2]->{'onload'}=&Apache::lonmenu::loadevents().';'.$onLoad;
	my $onUnload='';
	foreach my $key (keys(%{$token->[2]})) {
	    if ($key =~ /^onunload$/i) {
		$onUnload.=$token->[2]->{$key}.';';
		delete($token->[2]->{$key});
	    }
	}
	$token->[2]->{'onunload'}=&Apache::lonmenu::unloadevents().
	    ';'.$onUnload;
	
	$currentstring .= '<'.$token->[1];
	foreach (keys %{$token->[2]}) {
	    $currentstring.=' '.$_.'="'.$token->[2]->{$_}.'"';
	}
	$currentstring.='>';
	if ($ENV{'request.state'} ne 'published') {
	    $currentstring.=(<<EDITBUTTON);
		<form method="post">
		<input type="submit" name="editmode" value="Edit" />
		</form>
EDITBUTTON
	} else {
	    $currentstring.=&Apache::lonmenu::menubuttons(undef,$target,1);
	}
    } elsif ($target eq 'tex') {
	$currentstring = '\begin{document}';  
    } 
    return $currentstring;
}

sub end_body {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	$currentstring = '\end{document}';  
    } 
    return $currentstring;
}

#-- <center> tag
sub start_center {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	$currentstring = '\begin{center}';  
    }
    return $currentstring;
}

sub end_center {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	$currentstring = '\end{center}';  
    }
    return $currentstring;
}

#-- <b> tag
sub start_b {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	$currentstring = '\textbf{';  
    } 
    return $currentstring;
}

sub end_b {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	$currentstring = '}';  
    } 
    return $currentstring;
}

#-- <strong> tag
sub start_strong {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	$currentstring = '\textbf{';  
    } 
    return $currentstring;
}

sub end_strong {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	$currentstring = '}';  
    }
    return $currentstring;
}

#-- <h1> tag
sub start_h1 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	my $pre;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $pre='\begin{center}';
	} elsif ($align eq 'left') {
	    $pre='\rlap{';
	} elsif ($align eq 'right') {
	    $pre=' \hfill \llap{';
	}
	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
	if (not defined $TeXsize) {$TeXsize="large";}
	$currentstring .= $pre.'{\\'.$TeXsize.' \textbf{'; 
    } elsif ($target eq 'meta') {
	$currentstring='<subject>';
	&start_output();
    }
    return $currentstring;
}

sub end_h1 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	my $post;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $post='\end{center}';
	} elsif ($align eq 'left') {
	    $post='} \hfill'.'\vskip 0 mm ';
	} elsif ($align eq 'right') {
	    $post='}'.'\vskip 0 mm ';
	}
	$currentstring .= '}}'.$post;
    } elsif ($target eq 'meta') {
	&end_output();
	$currentstring='</subject>';
    } 
    return $currentstring;
}

#-- <h2> tag
sub start_h2 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	my $pre;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $pre='\begin{center}';
	} elsif ($align eq 'left') {
	    $pre='\rlap{';
	} elsif ($align eq 'right') {
	    $pre=' \hfill \llap{';
	}
	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
	if (not defined $TeXsize) {$TeXsize="large";}
	$currentstring .= $pre.'{\\'.$TeXsize.' \textbf{'; 
    } 
    return $currentstring;
}

sub end_h2 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	my $post;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $post='\end{center}';
	} elsif ($align eq 'left') {
	    $post='} \hfill'.'\vskip 0 mm ';
	} elsif ($align eq 'right') {
	    $post='}'.'\vskip 0 mm ';
	}
	$currentstring .= '}}'.$post;
    } 
    return $currentstring;
}

#-- <h3> tag
sub start_h3 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	my $pre;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $pre='\begin{center}';
	} elsif ($align eq 'left') {
	    $pre='\rlap{';
	} elsif ($align eq 'right') {
	    $pre=' \hfill \llap{';
	}
	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
	if (not defined $TeXsize) {$TeXsize="large";}
	$currentstring .= $pre.'{\\'.$TeXsize.' \textbf{'; 
    } 
    return $currentstring;
}

sub end_h3 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	my $post;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $post='\end{center}';
	} elsif ($align eq 'left') {
	    $post='} \hfill'.'\vskip 0 mm ';
	} elsif ($align eq 'right') {
	    $post='}'.'\vskip 0 mm ';
	}
	$currentstring .= '}}'.$post;
    } 
    return $currentstring;
}

#-- <h4> tag
sub start_h4 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	my $pre;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $pre='\begin{center}';
	} elsif ($align eq 'left') {
	    $pre='\rlap{';
	} elsif ($align eq 'right') {
	    $pre=' \hfill \llap{';
	}
	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
	if (not defined $TeXsize) {$TeXsize="large";}
	$currentstring .= $pre.'{\\'.$TeXsize.' \textbf{'; 
    } 
    return $currentstring;
}

sub end_h4 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	my $post;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $post='\end{center}';
	} elsif ($align eq 'left') {
	    $post='} \hfill'.'\vskip 0 mm ';
	} elsif ($align eq 'right') {
	    $post='}'.'\vskip 0 mm ';
	}
	$currentstring .= '}}'.$post;
    } 
    return $currentstring;
}

#-- <h5> tag
sub start_h5 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	my $pre;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $pre='\begin{center}';
	} elsif ($align eq 'left') {
	    $pre='\rlap{';
	} elsif ($align eq 'right') {
	    $pre=' \hfill \llap{';
	}
	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
	if (not defined $TeXsize) {$TeXsize="large";}
	$currentstring .= $pre.'{\\'.$TeXsize.' \textbf{'; 
    } 
    return $currentstring;
}

sub end_h5 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	my $post;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $post='\end{center}';
	} elsif ($align eq 'left') {
	    $post='} \hfill'.'\vskip 0 mm ';
	} elsif ($align eq 'right') {
	    $post='}'.'\vskip 0 mm ';
	}
	$currentstring .= '}}'.$post;
    } 
    return $currentstring;
}

#-- <h6> tag
sub start_h6 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	my $pre;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $pre='\begin{center}';
	} elsif ($align eq 'left') {
	    $pre='\rlap{';
	} elsif ($align eq 'right') {
	    $pre=' \hfill \llap{';
	}
	my $TeXsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval,undef,0);
	if (not defined $TeXsize) {$TeXsize="large";}
	$currentstring .= $pre.'{\\'.$TeXsize.' \textbf{'; 
    } 
    return $currentstring;
}

sub end_h6 {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	my $post;
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $post='\end{center}';
	} elsif ($align eq 'left') {
	    $post='} \hfill'.'\vskip 0 mm ';
	} elsif ($align eq 'right') {
	    $post='}'.'\vskip 0 mm ';
	}
	$currentstring .= '}}'.$post;
    } 
    return $currentstring;
}

#--- <cite> tag
sub start_cite {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= "\\textit{";
    }
    return $currentstring;
}

sub end_cite {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= "}";
    }
    return $currentstring;
}

#-- <i> tag
sub start_i {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= '\textit{';
    }
    return $currentstring;
}

sub end_i {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= '}';
    } 
    return $currentstring;
}

#-- <address> tag
sub start_address {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= "\\textit{";
    }
    return $currentstring;
}

sub end_address {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= "}";
    }
    return $currentstring;
}

#-- <dfn> tag
sub start_dfn {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= "\\textit{";
    } 
    return $currentstring;
}

sub end_dfn {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= "}";
    }
    return $currentstring;
}

#-- <tt> tag
sub start_tt {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= '\texttt{';
    }
    return $currentstring;
}

sub end_tt {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= '}';
    }
    return $currentstring;
}

#-- <kbd> tag
sub start_kbd {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= "\\texttt";
    }
    return $currentstring;
}

sub end_kbd {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= "}";
    }
    return $currentstring;
}

#-- <code> tag
sub start_code {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= '\texttt{';
    } 
    return $currentstring;
}

sub end_code {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= '}';
    } 
    return $currentstring;
}

#-- <em> tag
sub start_em {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= '\emph{';
    }
    return $currentstring;
}

sub end_em {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= '}';
    } 
    return $currentstring;
}

#-- <q> tag
sub start_q {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= "\\emph{";
    }
    return $currentstring;
}

sub end_q {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= "}";
    } 
    return $currentstring;
}

#-- <p> tag
sub start_p {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= '\par ';
    }
    return $currentstring;
}

sub end_p {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    }
    return $currentstring;
}

#-- <br> tag
sub start_br {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	if ($$tagstack[-2] ne 'sub' && $$tagstack[-2] ne 'sup') {
	    $currentstring .= '\vskip 0.2 mm ';
	}
    }
    return $currentstring;
}

sub end_br {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    }
    return $currentstring;
}

#-- <big> tag
sub start_big {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= '{\large ';
    } 
    return $currentstring;
}

sub end_big {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= '}';
    }
    return $currentstring;
}

#-- <small> tag
sub start_small {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= '{\footnotesize ';
    }
    return $currentstring;
}

sub end_small {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= '}';
    }
    return $currentstring;
}

#-- <basefont> tag
sub start_basefont {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	my $basesize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
	if (defined $basesize) {
	    $currentstring = '{\\'.$basesize.' ';
	}
    }
    return $currentstring;
}

sub end_basefont {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	my $basesize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
	if (defined $basesize) {
	    $currentstring = '}';
	}
    }
    return $currentstring;
}

#-- <font> tag
sub start_font {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
    my $currentstring = '';
    if ($target eq 'web') {
	my $face=&Apache::lonxml::get_param('face',$parstack,$safeeval);
	if ($face=~/symbol/i) {$Apache::lonxml::prevent_entity_encode++;}
	$currentstring = $token->[4];     
    }  elsif ($target eq 'tex') {
	my $fontsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
	if (defined $fontsize) {
	    $currentstring = '{\\'.$fontsize.' ';
	}
    }
    return $currentstring;
}

sub end_font {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval)=@_;
    my $currentstring = '';
    if ($target eq 'web') {
	my $face=&Apache::lonxml::get_param('face',$parstack,$safeeval);
	if ($face=~/symbol/i) {$Apache::lonxml::prevent_entity_encode--;}
	$currentstring = $token->[2];    
    }  elsif ($target eq 'tex') {
	my $fontsize=&Apache::lonxml::get_param('TeXsize',$parstack,$safeeval);
	if (defined $fontsize) {
	    $currentstring = '}';
	}
    }
    return $currentstring;
}
 
#-- <strike> tag
sub start_strike {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	&Apache::lonxml::startredirection();
    } 
    return $currentstring;
}

sub end_strike {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring=&Apache::lonxml::endredirection();
	$currentstring=~s/(\S)(\s+)(\S)/$1\}$2\\underline\{$3/g; 
	$currentstring=~s/^\s*(\S)/\\underline\{$1/; 
	$currentstring=~s/(\S)\s*$/$1\}/;
    }
    return $currentstring;
}

#-- <s> tag
sub start_s {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	&Apache::lonxml::startredirection();
    } 
    return $currentstring;
}

sub end_s {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring=&Apache::lonxml::endredirection();
	$currentstring=~s/(\S)(\s+)(\S)/$1\}$2\\underline\{$3/g;
	$currentstring=~s/^\s*(\S)/\\underline\{$1/;
	$currentstring=~s/(\S)\s*$/$1\}/;	
    }
    return $currentstring;
}

#-- <sub> tag
sub start_sub {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= "\$_{ ";
    } 
    return $currentstring;
}

sub end_sub {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= " }\$";
    }
    return $currentstring;
}

#-- <sup> tag
sub start_sup {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= "\$^{ ";
    } 
    return $currentstring;
}

sub end_sup {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= " }\$";
    }
    return $currentstring;
}

#-- <hr> tag
sub start_hr {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	my $LaTeXwidth = &Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
	if (defined $LaTeXwidth) {
	    if ($LaTeXwidth=~/^%/) {
		substr($LaTeXwidth,0,1)='';
		$LaTeXwidth=($LaTeXwidth/100).'\textwidth';
	    }
	} else {
	    $LaTeXwidth ='0.9\textwidth';
	}
	my ($pre,$post);
	my $align=&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1);
	if (($align eq 'center') || (not defined $align)) {
	    $pre=''; $post='';
	} elsif ($align eq 'left') {
	    $pre='\rlap{'; $post='} \hfill';
	} elsif ($align eq 'right') {
	    $pre=' \hfill \llap{'; $post='}';
	}
	$currentstring .= ' \vskip 0 mm \noindent\makebox['.$LaTeXwidth.']{'.$pre.'\makebox['.
                                    $LaTeXwidth.'][b]{\hrulefill}'.$post.'}\vskip 0 mm ';
    } 
    return $currentstring;
}

sub end_hr {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    }
    return $currentstring;
}

#-- <div> tag
sub start_div {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } 
    return $currentstring;
}

sub end_div {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } 
    return $currentstring;
}

#-- <a> tag
sub start_a {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	my $a=&Apache::lonxml::get_param('href',$parstack,$safeeval,undef,1);
	$a=~s/([^\\])%/$1\\\%/g;
	$currentstring .= '\ref{'.$a.'}';
    }
    return $currentstring;
}

sub end_a {
    my ($target,$token,$tagstack,$parstack,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    }
    return $currentstring;
}

#-- <li> tag
sub start_li {
    my ($target,$token,$tagstack,$parstack,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	my  $type=&Apache::lonxml::get_param('type',$parstack,$safeeval,undef,1);
	if ($type=~/circle/) {
	    $currentstring .= ' \item[o] ';
	} elsif ($type=~/square/) {
	    $currentstring .= ' \item[$\Box$] ';
	} elsif ($type ne '') { 
	    $currentstring .= ' \item['.$type.'] ';
	} else {
	    $currentstring .= ' \item ';
	}  
    } 
    return $currentstring;
}

sub end_li {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } 
    return $currentstring;
}

#-- <u> tag
sub start_u {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	&Apache::lonxml::startredirection();
    } 
    return $currentstring;
}

sub end_u {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring=&Apache::lonxml::endredirection();
	$currentstring=~s/(\S)(\s+)(\S)/$1\}$2\\underline\{$3/g;
	$currentstring=~s/^\s*(\S)/\\underline\{$1/;
	$currentstring=~s/(\S)\s*$/$1\}/;		
    }
    return $currentstring;
}

#-- <ul> tag
sub start_ul {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	my $TeXtype=&Apache::lonxml::get_param('type',$parstack,$safeeval,undef,0);
	if ($TeXtype eq 'disc') {
	    $currentstring .= ' \renewcommand{\labelitemi}{$\bullet$}
                                \renewcommand{\labelitemii}{$\bullet$} 
                                \renewcommand{\labelitemiii}{$\bullet$}
                                \renewcommand{\labelitemiv}{$\bullet$}';
	} elsif ($TeXtype eq 'circle') {
	    $currentstring .= ' \renewcommand{\labelitemi}{$\circ$}
                                \renewcommand{\labelitemii}{$\circ$} 
                                \renewcommand{\labelitemiii}{$\circ$}
                                \renewcommand{\labelitemiv}{$\circ$}';
	} elsif ($TeXtype eq 'square') {
	    $currentstring .= ' \renewcommand{\labelitemi}{$\diamond$}
                                \renewcommand{\labelitemii}{$\diamond$} 
                                \renewcommand{\labelitemiii}{$\diamond$}
                                \renewcommand{\labelitemiv}{$\diamond$}';
	}
	$currentstring .= '\begin{itemize}';  
    } 
    return $currentstring;
}

sub end_ul {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	$currentstring = '\end{itemize} \renewcommand{\labelitemi}{$\bullet$}
                                \renewcommand{\labelitemii}{$\bullet$} 
                                \renewcommand{\labelitemiii}{$\bullet$}
                                \renewcommand{\labelitemiv}{$\bullet$}';  
    } 
    return $currentstring;
}

#-- <menu> tag
sub start_menu {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	$currentstring = " \\begin{itemize} ";  
    } 
    return $currentstring;
}

sub end_menu {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	$currentstring = " \\end{itemize}";  
    } 
    return $currentstring;
}

#-- <dir> tag
sub start_dir {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	$currentstring = " \\begin{itemize} ";  
    } 
    return $currentstring;
}

sub end_dir {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	$currentstring = " \\end{itemize}";  
    } 
    return $currentstring;
}

#-- <ol> tag
sub start_ol {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	my $type=&Apache::lonxml::get_param('type',$parstack,$safeeval,undef,0);
	if ($type eq '1') {
	    $currentstring .= ' \renewcommand{\labelenumi}{\arabic{enumi}.}
                                \renewcommand{\labelenumii}{\arabic{enumii}.} 
                                \renewcommand{\labelenumiii}{\arabic{enumiii}.}
                                \renewcommand{\labelenumiv}{\arabic{enumiv}.}';
	} elsif ($type eq 'A') {
	    $currentstring .= ' \renewcommand{\labelenumi}{\Alph{enumi}.}
                                \renewcommand{\labelenumii}{\Alph{enumii}.} 
                                \renewcommand{\labelenumiii}{\Alph{enumiii}.}
                                \renewcommand{\labelenumiv}{\Alph{enumiv}.}';
	} elsif ($type eq 'a') {
	    $currentstring .= ' \renewcommand{\labelenumi}{\alph{enumi}.}
                                \renewcommand{\labelenumii}{\alph{enumii}.}
                                \renewcommand{\labelenumiii}{\alph{enumiii}.}
                                \renewcommand{\labelenumiv}{\alph{enumiv}.} ';
	} elsif ($type eq 'i') {
	    $currentstring .= ' \renewcommand{\labelenumi}{\roman{enumi}.}
                                \renewcommand{\labelenumii}{\roman{enumii}.}
                                \renewcommand{\labelenumiii}{\roman{enumiii}.}
                                \renewcommand{\labelenumiv}{\roman{enumiv}.} ';
	} elsif ($type eq 'I') {
	    $currentstring .= ' \renewcommand{\labelenumi}{\Roman{enumi}.}
                                \renewcommand{\labelenumii}{\Roman{enumii}.}
                                \renewcommand{\labelenumiii}{\Roman{enumiii}.}
                                \renewcommand{\labelenumiv}{\Roman{enumiv}.} ';
	}
	$currentstring .= '\begin{enumerate}';  
    } 
    return $currentstring;
}

sub end_ol {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	$currentstring = '\end{enumerate} \renewcommand{\labelenumi}{\arabic{enumi}.}
                                          \renewcommand{\labelenumii}{\arabic{enumii}.}
                                          \renewcommand{\labelenumiii}{\arabic{enumiii}.}
                                          \renewcommand{\labelenumiv}{\arabic{enumiv}.}';  
    } 
    return $currentstring;
}

#-- <dl> tag
sub start_dl {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	$currentstring = '\begin{description}';  
    } 
    return $currentstring;
}

sub end_dl {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	$currentstring = '\end{description}';  
    } 
    return $currentstring;
}

#-- <dt> tag
sub start_dt {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	$currentstring = '\item[';  
    } 
    return $currentstring;
}

sub end_dt {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } elsif ($target eq 'tex') {
	$currentstring = ']';  
    } 
    return $currentstring;
}

#-- <dd> tag
sub start_dd {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	if ($$tagstack[-2] eq 'dl') {
	    $currentstring = ' \item [] ';  
	}
    } 
    return $currentstring;
}

sub end_dd {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <table> tag
sub start_table {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $textwidth='';
    if (not defined @Apache::londefdef::table) {
	$textwidth=&recalc($ENV{'form.textwidth'});
	$textwidth=~/(\d+\.?\d*)/;
	$textwidth=0.95*$1;
    } else {
	$textwidth=&Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
    }
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	my $aa = {};
	push @Apache::londefdef::table, $aa; 
	$Apache::londefdef::table[-1]{'row_number'} = -1;
        #table's width
	my $TeXwidth = &Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
	if (not defined $TeXwidth) {
	    my $htmlwidth = &Apache::lonxml::get_param('width',$parstack,$safeeval,undef,1);
	    if ($htmlwidth=~/%/) {
		$htmlwidth=~/(\d+)/;
		my $value=$1*$textwidth/100;
		$Apache::londefdef::table[-1]{'width'}=$value;
	    } else {
		$Apache::londefdef::table[-1]{'width'}=$textwidth;
	    }
	} elsif ($TeXwidth=~/%/) {
	    $TeXwidth=~/(\d+)/;
	    my $value=$1*$textwidth/100;
            $Apache::londefdef::table[-1]{'width'}=$value;
	} else {
	    $Apache::londefdef::table[-1]{'width'}=$textwidth;
	}        
        #table's border
	my $border = &Apache::lonxml::get_param('border',$parstack,$safeeval,undef,1); 
	unless (defined $border) { $border = 0; }
	if ($border) { 
	    $Apache::londefdef::table[-1]{'hinc'} = '\hline '; 
	    $Apache::londefdef::table[-1]{'vinc'} = '&'; 
	    $Apache::londefdef::table[-1]{'vvinc'} = '|';
	} else {
	    $Apache::londefdef::table[-1]{'hinc'} = ''; 
	    $Apache::londefdef::table[-1]{'vinc'} = '&'; 
	    $Apache::londefdef::table[-1]{'vvinc'} = '';
	}
	$Apache::londefdef::table[-1]{'output'} = ' \noindent \begin{tabular} ';
	$currentstring = '\keephidden{NEW TABLE ENTRY}';
    }
    return $currentstring;
}
 
sub end_table {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	my $inmemory = '';
	my $output = '';
	#construct header of the table
	my $header_of_table = '{'.$Apache::londefdef::table[-1]{'vvinc'};
	for (my $in=0;$in<=$Apache::londefdef::table[-1]{'counter_columns'};$in++) {
	    $header_of_table .= $Apache::londefdef::table[-1]{'columns'}[$in].$Apache::londefdef::table[-1]{'vvinc'};
	}
	$header_of_table .= '}';
	#define the length of the table cells
	#always starts with TeXwidth (if defined everything else is ignored)
	my @length_row_final = split(/,/,$Apache::londefdef::table[-1]{'TeXlengthrow'}[0]);
	for (my $in=1;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
	    my @length_row = split(/,/,$Apache::londefdef::table[-1]{'TeXlengthrow'}[$in]);
	    for (my $jn=0;$jn<=$#length_row;$jn++) {
		if ($length_row_final[$jn]<$length_row[$jn]) {$length_row_final[$jn]=$length_row[$jn];}
	    }
	}
	#continues trying estimate the width of raw data
	my @length_raw_row = split(/,/,$Apache::londefdef::table[-1]{'lengthrow'}[0]);
	for (my $in=1;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
	    my @length_row = split(/,/,$Apache::londefdef::table[-1]{'lengthrow'}[$in]);
	    for (my $jn=0;$jn<=$#length_row;$jn++) {
		if ($length_raw_row[$jn]<$length_row[$jn]) {$length_raw_row[$jn]=$length_row[$jn];}
	    }
	}
        #comparing of TeXwidth and raw data width
	my $available_length=$Apache::londefdef::table[-1]{'width'};
	my $needed=0;
	for (my $jn=0;$jn<=$#length_row_final;$jn++) {
	    if ($length_row_final[$jn]!=0) {
		$available_length=$available_length-$length_row_final[$jn];
		$needed++;
	    }
	}
	$needed=$#length_row_final-$needed+1;
	for (my $jn=0;$jn<=$#length_row_final;$jn++) {
	    if ($length_row_final[$jn]==0) {
		if ($length_raw_row[$jn]<$available_length/3) {
		    $length_row_final[$jn]=$length_raw_row[$jn];
		    $available_length=$available_length-$length_raw_row[$jn];
		    $needed--;
		}
	    }
	}
	for (my $jn=0;$jn<=$#length_row_final;$jn++) {
	    if ($length_row_final[$jn]==0) {
		$length_row_final[$jn]=0.9*$available_length/$needed;
	    }
	}
	#fill the table
	for (my $in=0;$in<=$Apache::londefdef::table[-1]{'row_number'};$in++) {
	    for (my $jn=0;$jn<=$#length_row_final;$jn++) {
		my $substituted=$length_row_final[$jn];
		$Apache::londefdef::table[-1]{'rowdata'}[$in]=~s/TOBECHANGEDONNUMBER/$substituted mm/;
	    }
	    $output .=  $Apache::londefdef::table[-1]{'rowdata'}[$in];
	    chop $output;
	    $output .= ' \\\\ ';
	}
	$Apache::londefdef::table[-1]{'output'} .= $header_of_table.$output.$Apache::londefdef::table[-1]{'hinc'}.'\end{tabular}\vskip 0 mm ';
	if ($#Apache::londefdef::table > 0) {	    
	    my $inmemory = $Apache::londefdef::table[-1]{'output'};
	    pop @Apache::londefdef::table;
	    push @{$Apache::londefdef::table[-1]{'include'}}, $inmemory;
	} else {
	    $currentstring .= $Apache::londefdef::table[-1]{'output'};
	    pop @Apache::londefdef::table;
	    undef @Apache::londefdef::table;
	}
    }
    return $currentstring;
}

#-- <tr> tag
sub start_tr {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	$Apache::londefdef::table[-1]{'row_number'}++;
	my $alignchar = substr(&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1),0,1);
	if ($alignchar ne '') {
	    push @ {$Apache::londefdef::table[-1]{'rows'} }, $alignchar;
	} else {
	    push @ {$Apache::londefdef::table[-1]{'rows'} }, 'l';
	}
	push ( @{ $Apache::londefdef::table[-1]{'rowdata'} }, $Apache::londefdef::table[-1]{'hinc'});
	$Apache::londefdef::table[-1]{'counter_columns'} = -1;
	$Apache::londefdef::table[-1]{'TeXlength'} = '';
 	$Apache::londefdef::table[-1]{'length'} = '';
    } 
    return $currentstring;
}
        
sub end_tr {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	push @{ $Apache::londefdef::table[-1]{'TeXlengthrow'} },$Apache::londefdef::table[-1]{'TeXlength'};
	push @{ $Apache::londefdef::table[-1]{'lengthrow'} },$Apache::londefdef::table[-1]{'length'};
    }
    return $currentstring;
}

#-- <td> tag
sub start_td {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	my $what_to_push = substr(&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1),0,1);
	if ($what_to_push eq '') {
	    $what_to_push = substr($Apache::londefdef::table[-1]{'rows'}[0],0,1);;
	}
	push @{ $Apache::londefdef::table[-1]{'columns'} }, $what_to_push;
	$Apache::londefdef::table[-1]{'counter_columns'}++;
	&Apache::lonxml::startredirection();
    } 
    return $currentstring;
}   
     
sub end_td {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	my $current_row = $Apache::londefdef::table[-1]{'row_number'};
	my $data=&Apache::lonxml::endredirection();
	my $TeXwidth=&Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
	if (defined $TeXwidth) {		
	    my $current_length=&recalc($TeXwidth);
	    $current_length=~/(\d+)/;
	    $Apache::londefdef::table[-1]{'TeXlength'} .= $1.',';
	    $Apache::londefdef::table[-1]{'length'} .= '0,';
	} else {
	    if ($data=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) {
		my $current_length=&recalc($1);
		$current_length=~/(\d+\.?\d*)/;
		$Apache::londefdef::table[-1]{'TeXlength'} .= $1.',';
		$Apache::londefdef::table[-1]{'length'} .= '0,';
	    } else {  
		$data=~s/^\s+(\S.*)/$1/;
		$data=~s/(.*\S)\s+$/$1/;
		my $current_length=2*length($data);
		$Apache::londefdef::table[-1]{'length'} .= $current_length.',';
		$Apache::londefdef::table[-1]{'TeXlength'} .= '0,';
	    }        
	}
	for (my $in=0; $in<=$#{$Apache::londefdef::table[-1]{'include'}};$in++) {         
	    $data=~s/\\keephidden\{NEW TABLE ENTRY\}/$Apache::londefdef::table[-1]{'include'}[$in]/;
	}
	@{ $Apache::londefdef::table[-1]{'rowdata'} }[$current_row] .= '\parbox{TOBECHANGEDONNUMBER}{'.$data.'} '.$Apache::londefdef::table[-1]{'vinc'};
    }
    return $currentstring;
}

#-- <th> tag
sub start_th {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	my $what_to_push = substr(&Apache::lonxml::get_param('align',$parstack,$safeeval,undef,1),0,1);
	if ($what_to_push eq '') {
	    $what_to_push = substr($Apache::londefdef::table[-1]{'rows'}[0],0,1);;
	}
	push @{ $Apache::londefdef::table[-1]{'columns'} }, $what_to_push;
	$Apache::londefdef::table[-1]{'counter_columns'}++;
	&Apache::lonxml::startredirection();
    } 
    return $currentstring;
}   
     
sub end_th {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	my $current_row = $Apache::londefdef::table[-1]{'row_number'};
	my $data=&Apache::lonxml::endredirection();
	my $TeXwidth=&Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval,undef,0);
	if (defined $TeXwidth) {		
	    my $current_length=&recalc($TeXwidth);
	    $current_length=~/(\d+)/;
	    $Apache::londefdef::table[-1]{'TeXlength'} .= $1.',';
	    $Apache::londefdef::table[-1]{'length'} .= '0,';
	} else {
	    if ($data=~m/width\s*=\s*(\d+\.?\d*\s*(mm|cm|in|pc|pt)*)/) {
		my $current_length=&recalc($1);
		$current_length=~/(\d+)/;
		$Apache::londefdef::table[-1]{'TeXlength'} .= $1.',';
		$Apache::londefdef::table[-1]{'length'} .= '0,';
	    } else {     
		$data=~/^\s*(\S.*)/;
		$data=$1;
		$data=~/(.*\S)\s*$/;
		$data=$1;
		my $current_length=2*length($data);
		$Apache::londefdef::table[-1]{'length'} .= $current_length.',';
		$Apache::londefdef::table[-1]{'TeXlength'} .= '0,';
	    }        
	}
	for (my $in=0; $in<=$#{$Apache::londefdef::table[-1]{'include'}};$in++) {                                
	    $data=~s/\\keephidden\{NEW TABLE ENTRY\}/$Apache::londefdef::table[-1]{'include'}[$in]/;
	}
	$data='\textbf{'.$data.'}';
	@{ $Apache::londefdef::table[-1]{'rowdata'} }[$current_row] .= '\parbox{TOBECHANGEDONNUMBER}{'.$data.'} '.$Apache::londefdef::table[-1]{'vinc'};
    }
    return $currentstring;
}
#-- <img> tag
sub start_img {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $src = &Apache::lonxml::get_param('src',$parstack,$safeeval,
					 undef,1);
    $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=$src;
    my $currentstring = '';
    my $width_param = '';
    my $height_param = '';
    my $scaling = .3;
    
    if ($target eq 'web') {
	if ($ENV{'browser.imagesuppress'} ne 'on') {
	    $currentstring = $token->[4];
	} else {
	    my $alttag= &Apache::lonxml::get_param
		('alt',$parstack,$safeeval,undef,1);
	    unless ($alttag) {
		$alttag=&Apache::lonmeta::alttag
		    ($Apache::lonxml::pwd[-1],$src);
	    }
	    $currentstring='[IMAGE: '.$alttag.']';
	}
    } elsif ($target eq 'tex') {
	$src=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$src);
	&image_replication($src);
	
	#if original gif/jpg/png file exist do following:
	if (-e $src) {          
	    #defines the default size of image
	    my $image = Image::Magick->new;
	    my $current_figure = $image->Read($src);
	    $width_param = $image->Get('width') * $scaling;;
	    $height_param = $image->Get('height') * $scaling;;
	    undef $image;
	    #do we have any specified size of the picture?
	    my $TeXwidth = &Apache::lonxml::get_param('TeXwidth',$parstack,$safeeval);
	    my $TeXheight = &Apache::lonxml::get_param('TeXheight',$parstack,$safeeval);
	    my $width = &Apache::lonxml::get_param('width',$parstack,$safeeval,
						   undef,1);
	    if ($TeXwidth ne '') {  
		if ($TeXwidth=~/(\d+)\s*\%/) {
		    $width_param = $1*$ENV{'form.textwidth'}/100;
		} else { 
		    $width_param = $TeXwidth;
		}
	    } elsif ($TeXheight ne '') {
		$width_param = $TeXheight/$height_param*$width_param;
	    } elsif ($width ne '') {
		$width_param = $width*$scaling;      
	    }
	    my $file;
	    my $path;	
	    if ($src =~ m!(.*)/([^/]*)$!) {
		$file = $2; 
		$path = $1.'/'; 
	    } 
	    my $newsrc = $src;
	    $newsrc =~ s/\.(gif|jpg|png)$/.eps/i;
	    $file=~s/\.(gif|jpg|png)$/.eps/i;
	    #where can we find the picture?
	    if (-e $newsrc) {
		#eps counterpart for image exist 
		if ($path) {
		    $currentstring .= '\vskip 1 mm \noindent\graphicspath{{'.$path.'}}\includegraphics[width='.$width_param.' mm]{'.$file.'} ';
		}
	    } else {
		#there is no eps counterpart for image - check for ps one
		$newsrc =~ s/\.eps$/\.ps/;
		if (-e $newsrc) {
		    #ps counterpart for image exist 
		    $file =~ s/\.eps$/\.ps/;
		    if ($path) {
			$currentstring .= '\vskip 1 mm \noindent\graphicspath{{'.$path.'}}\includegraphics[width='.$width_param.' mm]{'.$file.'} ';
		    }
		} else {
		    #there aren't eps or ps - so create eps 
		    my $temp_file;
		    my $filename = "/home/httpd/prtspool/$ENV{'user.name'}_$ENV{'user.domain'}_printout.dat";
		    $temp_file = Apache::File->new('>>'.$filename); 
		    print $temp_file "$src\n";
		    $currentstring .= '\vskip 1 mm \graphicspath{{/home/httpd/prtspool/}}\includegraphics[width='.$width_param.' mm]{'.$file.'} ';
		}
	    }
	} else {
	    #original image file doesn't exist so check the alt attribute
	    my $alt = 
		&Apache::lonxml::get_param('alt',$parstack,$safeeval,undef,1);
	    unless ($alt) {
		$alt=&Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],$src);
	    }

	    if ($alt) {
		$currentstring .= ' '.$alt.' ';
	    } else {
		#<allow> tag will care about replication 
	    }
	}
    }
    return $currentstring;
}

sub end_img {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring = '';
    }
    return $currentstring;
}

#-- <applet> tag
sub start_applet {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    
    my $code=&Apache::lonxml::get_param('code',$parstack,$safeeval,undef,1);
    $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=$code;
    
    my $archive=&Apache::lonxml::get_param('archive',$parstack,$safeeval,
					   undef,1);
    $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=$archive;
    
    my $currentstring = '';
    if ($target eq 'web') {
	if ($ENV{'browser.appletsuppress'} ne 'on') {
	    $currentstring = $token->[4];
	} else {
	    my $alttag= &Apache::lonxml::get_param('alt',$parstack,
						   $safeeval,undef,1);
	    unless ($alttag) {
		$alttag=&Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],
						 $code);
	    }
	    $currentstring='[APPLET: '.$alttag.']';
	}
    } elsif ($target eq 'tex') {
	$currentstring = " \\begin{figure} ";
    } 
    return $currentstring;
}

sub end_applet {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring = " \\end{figure}";
    } 
    return $currentstring;
}

#-- <embed> tag
sub start_embed {    
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $src=&Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
    $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=$src;
    my $currentstring = '';
    if ($target eq 'web') {
	if ($ENV{'browser.embedsuppress'} ne 'on') {
	    $currentstring = $token->[4];
	} else {
	    my $alttag=&Apache::lonxml::get_param
		('alt',$parstack,$safeeval,undef,1);
	    unless ($alttag) {
		$alttag=&Apache::lonmeta::alttag($Apache::lonxml::pwd[-1],$src);
	    }
	    $currentstring='[EMBED: '.$alttag.']';
	}
    } elsif ($target eq 'tex') {
	$currentstring = " \\begin{figure} ";  
    } 
    return $currentstring;
}

sub end_embed {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	$currentstring = " \\end{figure}";  
    } 
    return $currentstring;
}

#-- <param> tag
sub start_param {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    if (&Apache::lonxml::get_param
	('name',$parstack,$safeeval,undef,1)=~/^cabbase$/i) {
	$Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
	    &Apache::lonxml::get_param('value',$parstack,$safeeval,undef,1);
    }   
    $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=   
	&Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } elsif ($target eq 'tex') {
	$currentstring = " \\begin{figure} ";  
    } 
    return $currentstring;
}

sub end_param {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];     
    } elsif ($target eq 'tex') {
	$currentstring = " \\end{figure}";  
    } 
    return $currentstring;
}

#-- <allow> tag
sub start_allow {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $src = &Apache::lonxml::get_param('src',$parstack,$safeeval,undef,1);
    $src=&Apache::lonnet::filelocation($Apache::lonxml::pwd[-1],$src);
    $Apache::lonxml::extlinks[$#Apache::lonxml::extlinks+1]=
	&Apache::lonnet::clutter($src);
    &image_replication($src);
    my $result;
    if ($target eq 'edit') {
	$result .=&Apache::edit::tag_start($target,$token);
	$result .=&Apache::edit::text_arg('File Spec:','src',$token,70);
	$result .=&Apache::edit::end_row();#.&Apache::edit::start_spanning_row();
    } elsif ($target eq 'modified') {
	my $constructtag=&Apache::edit::get_new_args($token,$parstack,
						     $safeeval,'src');
	if ($constructtag) { $result = &Apache::edit::rebuild_tag($token); }
    }
    return $result;
}

sub end_allow {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    if ( $target eq 'edit') { return (&Apache::edit::end_table()); }
    return '';
}

#-- Frames
sub start_frameset {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') { 
	if (!$Apache::lonxml::registered) {
	    $currentstring.='<head>'.
		&Apache::lonmenu::registerurl(undef,$target).'</head>';
	}
	my $onLoad='';
	foreach my $key (keys(%{$token->[2]})) {
	    if ($key =~ /^onload$/i) {
		$onLoad.=$token->[2]->{$key}.';';
		delete($token->[2]->{$key});
	    }
	}
	$token->[2]->{'onload'}=&Apache::lonmenu::loadevents().';'.$onLoad;
	my $onUnload='';
	foreach my $key (keys(%{$token->[2]})) {
	    if ($key =~ /^onunload$/i) {
		$onUnload.=$token->[2]->{$key}.';';
		delete($token->[2]->{$key});
	    }
	}
	$token->[2]->{'onunload'}=&Apache::lonmenu::unloadevents().
	    ';'.$onUnload;
	
	$currentstring .= '<'.$token->[1];
	foreach (keys %{$token->[2]}) {
	    $currentstring.=' '.$_.'="'.$token->[2]->{$_}.'"';
	}
	$currentstring.='>';
    }
    return $currentstring;
}

sub end_frameset {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];
    }
    return $currentstring;
}

#-- <pre>
sub start_pre {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[4];
    } elsif ($target eq 'tex') {
	$currentstring .= '\begin{verbatim}';
    } 
    return $currentstring;
}

sub end_pre {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= $token->[2];
    } elsif ($target eq 'tex') {
	$currentstring .= '\end{verbatim}';
    }
    return $currentstring;
}

#-- <insert>
sub start_insert {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	my $display = &Apache::lonxml::get_param('display',$parstack,$safeeval,undef,1);
	$currentstring .= '<b>'.$display.'</b>';;
    }
    return $currentstring;
}

sub end_insert {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= '';
    }
    return $currentstring;
}

#-- <externallink>
sub start_externallink {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	my $display = &Apache::lonxml::get_param('display',$parstack,$safeeval,undef,1);
	$currentstring .= '<b>'.$display.'</b>';;
    }
    return $currentstring;
}

sub end_externallink {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring .= '';
    }
    return $currentstring;
}

#-- <blankspace heigth="">
sub start_blankspace {
    my ($target,$token,$tagstack,$parstack,$parser,$safeeval) = @_;
    my $currentstring = '';
    if ($target eq 'tex') {
	my $howmuch = &Apache::lonxml::get_param('heigth',$parstack,$safeeval,undef,1);
	$currentstring .= '\vskip '.$howmuch.' ';
    }
    return $currentstring;
}

sub end_blankspace {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'tex') {
	$currentstring .= '';
    }
    return $currentstring;
}

#-- <abbr> tag
sub start_abbr {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_abbr {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <acronym> tag
sub start_acronym {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_acronym {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <area> tag
sub start_area {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_area {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <base> tag
sub start_base {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_base {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <bdo> tag
sub start_bdo {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_bdo {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <bgsound> tag
sub start_bgsound {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_bgsound {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <blink> tag
sub start_blink {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_blink {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <blockquote> tag
sub start_blockquote {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_blockquote {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <button> tag
sub start_button {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_button {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <caption> tag
sub start_caption {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_caption {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <col> tag
sub start_col {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_col {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <colgroup> tag
sub start_colgroup {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_colgroup {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <del> tag
sub start_del {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_del {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <fieldset> tag
sub start_fieldset {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_fieldset {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <frame> tag
sub start_frame {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_frame {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <iframe> tag
sub start_iframe {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_iframe {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <ins> tag
sub start_ins {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_ins {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <isindex> tag
sub start_isindex {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_isindex {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <keygen> tag
sub start_keygen {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_keygen {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <label> tag
sub start_label {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_label {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <layer> tag
sub start_layer {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_layer {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <legend> tag
sub start_legend {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_legend {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <link> tag
sub start_link {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_link {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <marquee> tag
sub start_marquee {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_marquee {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <malticol> tag
sub start_malticol {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_malticol {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <nobr> tag
sub start_nobr {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_nobr {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <noembed> tag
sub start_noembed {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_noembed {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <noframes> tag
sub start_noframes {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_noframes {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <nolayer> tag
sub start_nolayer {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_nolayer {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <noscript> tag
sub start_noscript {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_noscript {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <object> tag
sub start_object {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_object {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <optgroup> tag
sub start_optgroup {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_optgroup {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <samp> tag
sub start_samp {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_samp {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <server> tag
sub start_server {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_server {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <spacer> tag
sub start_spacer {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_spacer {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <span> tag
sub start_span {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_span {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <tbody> tag
sub start_tbody {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_tbody {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <tfoot> tag
sub start_tfoot {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_tfoot {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <thead> tag
sub start_thead {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_thead {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <var> tag
sub start_var {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_var {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}

#-- <wbr> tag
sub start_wbr {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[4];     
    } 
    return $currentstring;
}

sub end_wbr {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = $token->[2];    
    } 
    return $currentstring;
}


#-- <hideweboutput> tag
sub start_hideweboutput {
    my ($target,$token) = @_;
    if ($target eq 'web') {
	&Apache::lonxml::startredirection();     
    } 
    return '';
}

sub end_hideweboutput {
    my ($target,$token) = @_;
    my $currentstring = '';
    if ($target eq 'web') {
	$currentstring = &Apache::lonxml::endredirection();    
    } 
    return '';
}


sub image_replication {
    my $src = shift;
    if (not -e $src) {
	#replicates image itself
	&Apache::lonnet::repcopy($src);
	#replicates eps or ps 
	my $newsrc = $src;
	$newsrc =~ s/\.(gif|jpg|jpeg|png)$/.eps/i;
	if (not -e $newsrc) {
	    if (&Apache::lonnet::repcopy($newsrc) ne 'OK') {
		$newsrc =~ s/\.eps$/\.ps/;
		&Apache::lonnet::repcopy($newsrc);
	    }
	}
    }
    return '';
}

sub recalc {
    my $argument = shift;
    if (not $argument=~/(mm|cm|in|pc|pt)/) {return $argument.' mm';}
    $argument=~/\s*(\d+\.?\d*)\s*(mm|cm|in|pc|pt)/;
    my $value=$1;
    my $units=$2;
    if ($units eq 'cm') {
	$value*=10;
    } elsif ($units eq 'in') {
	$value*=25.4;
    } elsif ($units eq 'pc') {
	$value*=(25.4*12/72.27);
    } elsif ($units eq 'pt') {
	$value*=(25.4/72.27);
    }
    return $value.' mm';
}

1;
__END__