rem: else return false; 
add: } else { menuItem.setAttribute("hidden","true"); return false; } 
context: function IsGetNextNMessagesEnabled(){	var selectedFolders = GetSelectedMsgFolders();    var numFolders = selectedFolders.length;    if(numFolders !=1)        return false;    var folder = selectedFolders[0];    if (!folder)        return false;       var server = folder.server;    var serverType = server.type;       if((serverType == "nntp"))        return true;    else return false;}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/847e6c3bc614d0dc0f06e477440bebb51a3a9d30/mailWindowOverlay.js/buggy/mailnews/base/resources/content/mailWindowOverlay.js