--- loncom/xml/lontexconvert.pm	2006/05/30 12:47:53	1.75
+++ loncom/xml/lontexconvert.pm	2006/09/06 19:43:22	1.77
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # TeX Conversion Module
 #
-# $Id: lontexconvert.pm,v 1.75 2006/05/30 12:47:53 www Exp $
+# $Id: lontexconvert.pm,v 1.77 2006/09/06 19:43:22 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -176,13 +176,16 @@ sub jsMath_converted {
 }
 
 {
-    my $jsMath_sent_header;
+    my @jsMath_sent_header;
     sub jsMath_reset {
-	$jsMath_sent_header=0;
+	undef(@jsMath_sent_header);
+    }
+    sub jsMath_push {
+	push(@jsMath_sent_header,0);
     }
     sub jsMath_header {
-	return '' if $jsMath_sent_header;
-	$jsMath_sent_header=1;
+	return '' if $jsMath_sent_header[-1];
+	$jsMath_sent_header[-1]=1;
 	return
             '<script type="text/javascript">
                      function NoFontMessage () {}
@@ -190,14 +193,15 @@ sub jsMath_converted {
 	    '<script type="text/javascript" src="/adm/jsMath/jsMath.js"></script>'."\n";
     }
     sub jsMath_process {
-	return '' if !$jsMath_sent_header;
+	my $state = pop(@jsMath_sent_header);
+	return '' if !$state;
 	return '<script type="text/javascript">jsMath.Process()</script>';
     }
 }
 
 sub init_math_support {
     &init_tth();
-    &Apache::lontexconvert::jsMath_reset();
+    &Apache::lontexconvert::jsMath_push();
     if ($env{'environment.texengine'} eq 'jsMath' ||
 	$env{'form.texengine'}        eq 'jsMath' ) {
 	return &Apache::lontexconvert::jsMath_header();
@@ -348,9 +352,6 @@ sub postprocess_algebra {
     # moodle had these and I don't know why, ignoring them for now
     # $string =~s/\\fun/ /g;
 
-    # remove the extra () in the denominator of a \frac
-    $string =~s/\\frac{(.+?)}{\\left\((.+?)\\right\)}/\\frac{$1}{$2}/gs;
-    
     # sqrt(3,4) means the 4 root of 3
     $string =~s/\\sqrt{([^,]+),([^\}]+)}/\\sqrt[$2]{$1}/gs;