rem: if(!threadTree) dump('thread tree is null\n'); 
context: function GetThreadTree(){    if (gThreadTree) return gThreadTree;	var threadTree = document.getElementById('threadTree');	if(!threadTree)		dump('thread tree is null\n');    gThreadTree = threadTree;	return threadTree;}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/cc31405197556d53c57690b830263c255707b8e3/msgMail3PaneWindow.js/buggy/mailnews/base/resources/content/msgMail3PaneWindow.js