Index: misc/drupal.js
===================================================================
RCS file: /cvs/drupal/drupal/misc/drupal.js,v
retrieving revision 1.22
diff -u -r1.22 drupal.js
--- misc/drupal.js	27 Apr 2006 18:12:25 -0000	1.22
+++ misc/drupal.js	21 May 2006 12:06:18 -0000
@@ -259,7 +259,7 @@
   if (!hasClass(node, className)) {
     return false;
   }
-  node.className = eregReplace('(^| )'+ className +'($| )', '', node.className);
+  node.className = eregReplace('(^|\\s+\\b)'+ className +'($|\\b(?=[^-]))', '', node.className); 
   return true;
 }