rem: if (message_menuitem){ message_menuitem.setAttribute('checked',!IsThreadAndMessagePaneSplitterCollapsed()); 
add:  if (message_menuitem) { var message_menuitem_hidden = message_menuitem.getAttribute("hidden"); if(message_menuitem_hidden != "true"){ message_menuitem.setAttribute('checked',!IsThreadAndMessagePaneSplitterCollapsed()); } 
context: function view_init(){	var message_menuitem=document.getElementById('menu_showMessage');	if (message_menuitem){		message_menuitem.setAttribute('checked',!IsThreadAndMessagePaneSplitterCollapsed());	}	var threadColumn = document.getElementById('ThreadColumnHeader');	var thread_menuitem=document.getElementById('menu_showThreads');	if (threadColumn && thread_menuitem){		thread_menuitem.setAttribute('checked',threadColumn.getAttribute('currentView')=='threaded');	}}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/85f7d1763cbf968efe677109084ba5acd3391652/mailWindowOverlay.js/clean/mailnews/base/resources/content/mailWindowOverlay.js