rem: EnableMenuItem(menuID, true); 
add: EnableMenuItem(menuID, (numSelected == 1)); 
context: function SetupNewMessageWindowMenuItem(menuID, numSelected, forceHide){	ShowMenuItem(menuID, (numSelected <= 1) && !forceHide);	EnableMenuItem(menuID, true);}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/c1c9a40d8ceda5299f268b730d0dd1d9f4b86425/mailContextMenus.js/clean/mailnews/base/resources/content/mailContextMenus.js