rem: window.frames["messagepane"].location = "about:blank"; 
add: window.frames["messagepane"].location = "about:blank"; 
context: function ClearMessagePane(){	if(gHaveLoadedMessage)	{	    gHaveLoadedMessage = false;		gCurrentDisplayedMessage = null;		if (window.frames["messagepane"].location != "about:blank")		        window.frames["messagepane"].location = "about:blank";		// hide the message header view AND the message pane...		HideMessageHeaderPane();	}}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/078d452f9975c6beee7d95d05f22c90055ccf3b5/msgMail3PaneWindow.js/buggy/mailnews/base/resources/content/msgMail3PaneWindow.js