add: if(markFlagged == null) { markFlagged= !SelectedMessagesAreFlagged(); }  
context: function MsgMarkAsFlagged(markFlagged){	var selectedMessages = GetSelectedMessages();	var compositeDataSource = GetCompositeDataSource("MarkMessageFlagged");	MarkMessagesFlagged(compositeDataSource, selectedMessages, markFlagged);}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/d63000ffb06f1c74b5d3215477135715d57355d7/mailWindowOverlay.js/clean/mailnews/base/resources/content/mailWindowOverlay.js