rem: buttonNode = buttonNode.nextSibling; 
add: buttonNode = buttonNode.previousSibling; 
context: function allLeftButtonsAreHidden(){  var buttonNode = document.getElementById("PersonalToolbar").firstChild;  while(buttonNode.tagName != "toolbarseparator") {    if(!buttonNode.hasAttribute("hidden") || buttonNode.getAttribute("hidden") == "false")      return false;    buttonNode = buttonNode.nextSibling;  }  return true;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/f19bf684f113c2f5bb889c1461c03fe316cc138b/navigator.js/buggy/suite/browser/navigator.js