rem: GoPreviousMessage(GoUnreadMessage, true); 
add: GoPreviousMessage(navigateUnread, true); 
context: function MsgPreviousUnreadMessage(){	GoPreviousMessage(GoUnreadMessage, true);}
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/d04174bf7b6b57f1c23923c2a9cbcf1223681cb5/widgetglue.js/buggy/mailnews/base/resources/content/widgetglue.js