Index: dojo-release-1.3.2-src/dojo/_base/event.js
===================================================================
--- dojo-release-1.3.2-src.orig/dojo/_base/event.js	2009-09-04 11:21:10.000000000 -0700
+++ dojo-release-1.3.2-src/dojo/_base/event.js	2009-09-04 11:23:00.000000000 -0700
@@ -28,7 +28,7 @@
 						// which causes isDescendant to return false which causes
 						// spurious, and more importantly, incorrect mouse events to fire.
 						// TODO: remove tagName check when Firefox 2 is no longer supported
-						try{ e.relatedTarget.tagName; }catch(e2){ return; }
+						try{ e.relatedTarget && e.relatedTarget.tagName; }catch(e2){ return; }
 					}
 					if(!dojo.isDescendant(e.relatedTarget, node)){
 						// e.type = oname; // FIXME: doesn't take? SJM: event.type is generally immutable.