rem: var showing = (item.getAttribute('hidden') !='true'); if(item && (showItem != showing)) item.setAttribute('hidden', showItem ? '' : 'true'); 
add: if(item) { var showing = (item.getAttribute('hidden') !='true'); if(showItem != showing) item.setAttribute('hidden', showItem ? '' : 'true'); } 
context: function ShowMenuItem(id, showItem){	var item = document.getElementById(id);	var showing = (item.getAttribute('hidden') !='true');	if(item && (showItem != showing))		item.setAttribute('hidden', showItem ? '' : 'true');}
meta: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/18196c4b732af6b94e9651fc3dc40ab0eabfa685/mailContextMenus.js/clean/mailnews/base/resources/content/mailContextMenus.js