rem: if (window.frames["messagepane"].location != "about:blank") window.frames["messagepane"].location = "about:blank";  
add: if (GetMessagePaneFrame().currentURI != "about:blank") GetMessagePaneFrame().loadURI("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: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/1abe49ca36fe26d55a1c32bb2f9a232f375c30b7/msgMail3PaneWindow.js/buggy/mailnews/base/resources/content/msgMail3PaneWindow.js