--- rat/lonratedt.pm	2005/06/08 16:35:46	1.69
+++ rat/lonratedt.pm	2005/06/08 17:42:01	1.70
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Edit Handler for RAT Maps
 #
-# $Id: lonratedt.pm,v 1.69 2005/06/08 16:35:46 www Exp $
+# $Id: lonratedt.pm,v 1.70 2005/06/08 17:42:01 www Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -173,7 +173,7 @@ use Apache::loncommon;
 use Apache::lonlocal;
 use File::Copy;
 
-use vars qw(@order @resources @resparms @zombies %revzombies);
+use vars qw(@order @resources @resparms @zombies);
 
 
 # Mapread read maps into global arrays @links and @resources, determines status
@@ -189,13 +189,11 @@ sub mapread {
     undef @order;
     undef @resparms;
     undef @zombies;
-    undef %revzombies;
 
     @resources=('');
     @order=();
     @resparms=();
     @zombies=();
-    %revzombies=();
 
     my ($outtext,$errtext)=&Apache::lonratsrv::loadmap($fn,'');
     if ($errtext) { return ($errtext,2); }
@@ -210,7 +208,6 @@ sub mapread {
 		$resources[$number]=$content;
 	    } else {
 		$zombies[$number]=$content;
-		$revzombies{$src}=$number;
 	    }
         }
         if ($command eq 'objlinks') {
@@ -449,10 +446,20 @@ sub buttons {
     return $output.'</form><hr>';
 }
 
-# ----------------------------------------------------- Get an unused res index
+# ------------------------------------- Revive zombie idx or get unused number
 
-sub unusedindex {
-    return 1+($#resources>$#zombies?$#resources:$#zombies);
+sub getresidx {
+    my $url=shift;
+    my $max=1+($#resources>$#zombies?$#resources:$#zombies);
+    unless ($url) { return $max; }
+    for (my $i=0; $i<=$#zombies; $i++) {
+	my ($title,$src,$ext,$type)=split(/\:/,$zombies[$i]);
+	if ($src eq $url) {
+	    undef $zombies[$i];
+	    return $i;
+	}
+    }
+    return $max;
 }
 
 # ----------------------------------------------------------- Paste into target
@@ -467,7 +474,7 @@ sub pastetarget {
             $name=&Apache::lonnet::unescape($name);
             $url=&Apache::lonnet::unescape($url);
             if ($url) {
-	       my $idx=&unusedindex();
+	       my $idx=&getresidx($url);
                $insertorder[$#insertorder+1]=$idx;
                my $ext='false';
                if ($url=~/^http\:\/\//) { $ext='true'; }
@@ -513,7 +520,7 @@ sub startfinish {
    $resources[$order[0]]=$name.':'.$url.':'.$ext.':start:res';
 # Make sure this has at least start and finish
    if ($#order==0) {
-       $resources[&unusedindex()]='::false';
+       $resources[&getresidx()]='::false';
        $order[1]=$#resources;
    }
 # Make the last one a finish resource