rem: var menuItem = document.getElementById(menuItemId);  if(menuItem) menuItem.setAttribute('label', customLabel); 
add: var menuItem = document.getElementById(menuItemId); if (menuItem) menuItem.setAttribute('label', customLabel); 
context: function SetMenuItemLabel(menuItemId, customLabel){    var menuItem = document.getElementById(menuItemId);    if(menuItem)        menuItem.setAttribute('label', customLabel);}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/78b043e7d257a64e5165004c5a976561c6749b4d/mailWindowOverlay.js/clean/mailnews/base/resources/content/mailWindowOverlay.js