rem: if (index) { 
add: if (!index) return false; try { 
context: function gotoHistoryIndex(aEvent){  var index = aEvent.target.getAttribute("index");  if (index) {    getWebNavigation().gotoIndex(index);    return true;  }  return false;}
meta: 5872	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5872/a7fd382c2900a5551cc1a790107cedd909bd951a/navigator.js/clean/suite/browser/navigator.js