--- loncom/xml/lontexconvert.pm	2012/05/10 19:19:30	1.112.2.1
+++ loncom/xml/lontexconvert.pm	2013/09/22 02:04:31	1.112.2.3
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # TeX Conversion Module
 #
-# $Id: lontexconvert.pm,v 1.112.2.1 2012/05/10 19:19:30 raeburn Exp $
+# $Id: lontexconvert.pm,v 1.112.2.3 2013/09/22 02:04:31 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -241,6 +241,36 @@ sub displaystyle {
     return 0;
 }
 
+sub MathJax_converted {
+    my $texstring=shift;
+    my $tag='math/tex;';
+    if (&displaystyle($texstring)) { $tag='math/tex; mode=display'; }
+    &clean_out_math_mode($texstring);
+    return &MathJax_header().
+      '<script type="'.$tag.'">'.$$texstring.'</script>';
+}
+
+{
+    #Relies heavily on the previous jsMath installation
+    my @MathJax_sent_header;
+    sub MathJax_reset {
+        undef(@MathJax_sent_header);
+    }
+    sub MathJax_push {
+        push(@MathJax_sent_header,0);
+    }
+    sub MathJax_header {
+        if (!@MathJax_sent_header) {
+            &Apache::lonnet::logthis("mismatched calls of MathJax_header and MathJax_process");
+            return '';
+        }
+        return '' if $MathJax_sent_header[-1];
+        $MathJax_sent_header[-1]=1;
+        return
+          '<script type="text/javascript" src="/adm/MathJax/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>'."\n";
+    }
+}
+
 sub jsMath_converted {
     my $texstring=shift;
     my $tag='span';
@@ -308,6 +338,11 @@ sub init_math_support {
 	($inherit_jsmath && &jsMath_state(-2))) {
 	return &Apache::lontexconvert::jsMath_header();
     }
+    &Apache::lontexconvert::MathJax_push();
+    if (lc(&tex_engine()) eq 'mathjax') { # ||
+        #($inherit_jsmath && &jsMath_state(-2))) {
+        return &Apache::lontexconvert::MathJax_header();
+    }
     return;
 }
 
@@ -368,6 +403,8 @@ sub converted {
 	return &tth_converted($string);
     } elsif ($mode =~ /jsmath/i) {
 	return &jsMath_converted($string);
+    } elsif ($mode =~ /mathjax/i) {
+        return &MathJax_converted($string);
     } elsif ($mode =~ /mimetex/i) {
 	return &mimetex_converted($string);
     } elsif ($mode =~ /raw/i) {
@@ -447,7 +484,7 @@ sub msgtexconverted {
     foreach my $fragment (split(/(?:\&lt\;|\<)\/*algebra\s*(?:\&gt\;|\>)/i,
 				$message)) {
 	if ($tex) {
-        my $algebra = &algebra($fragment, 'web', undef, undef, undef, undef, 'tth');
+        my $algebra = &algebra($fragment, 'web', undef, undef, undef, 'tth');
 	    if ($email) {
 		$outmessage.='</pre><tt>'.$algebra.'</tt><pre>';
 		$tex=0;
@@ -576,6 +613,9 @@ Header
 
 =item jsMath_converted()
 
+=item MathJax_converted()
+        - Mimics the jsMath functionality
+
 =item tex_engine()