add: if(markFlagged == null) { markFlagged= !SelectedMessagesAreFlagged(); }  
context: function MsgMarkAsFlagged(markFlagged){	var selectedMessages = GetSelectedMessages();	var compositeDataSource = GetCompositeDataSource("MarkMessageFlagged");	MarkMessagesFlagged(compositeDataSource, selectedMessages, markFlagged);}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/0938bbb70031b70863a26099bd6eab59d9a14e34/mailWindowOverlay.js/clean/mailnews/base/resources/content/mailWindowOverlay.js