rem: while(parent.nodeName == 'treeitem') 
add: while(parent.localName == 'treeitem') 
context: function FindTopLevelMessage(startMessage){	var currentTop = startMessage;	var parent = startMessage.parentNode.parentNode;	while(parent.nodeName == 'treeitem')	{		currentTop = parent;		parent = parent.parentNode.parentNode;	}	return currentTop;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/bd1bd21d215f4d0b8d97ee7085b542ad0c8c59ff/msgViewNavigation.js/clean/mailnews/base/resources/content/msgViewNavigation.js