rem: if(item) { var showing = (item.getAttribute('hidden') !='true'); if(showItem != showing) item.setAttribute('hidden', showItem ? '' : 'true'); } 
add: if(item && item.hidden != "true") item.hidden = !showItem; 
context: function ShowMenuItem(id, showItem){  var item = document.getElementById(id);  if(item)  {    var showing = (item.getAttribute('hidden') !='true');    if(showItem != showing)      item.setAttribute('hidden', showItem ? '' : 'true');  }}
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/feb2a2609857b2d52bbca994a635bbf72abbcbb7/mailContextMenus.js/clean/mailnews/base/resources/content/mailContextMenus.js