rem: if (headerListInfo.useToggle != undefined) 
add: if ("useToggle" in headerListInfo) 
context: function createHeaderEntry(prefix, headerListInfo){  var partialIDName = prefix + headerListInfo.name;  //dump('enclosingBox id = ' + partialIDName + 'Box' + '\n');  this.enclosingBox = document.getElementById(partialIDName + 'Box');  //dump(this.enclosingBox + \'n');  this.textNode = document.getElementById(partialIDName + 'Value');  this.isValid = false;  if (headerListInfo.useToggle != undefined)  {    this.useToggle = headerListInfo.useToggle;    if (this.useToggle) // find the toggle icon in the document    {      this.toggleIcon = document.getElementById(partialIDName + 'ToggleIcon');      this.longTextNode = document.getElementById(partialIDName + 'Value' + 'Long');    }  }  else   this.useToggle = false;  if (headerListInfo.useShortView != undefined)    this.useShortView = headerListInfo.useShortView;  else    this.useShortView = false;  if (headerListInfo.outputFunction != undefined)    this.outputFunction = headerListInfo.outputFunction;  else    this.outputFunction = updateHeaderValue;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/74e499212ea9ca3114455030c544d2c06b024b88/msgHdrViewOverlay.js/buggy/mailnews/base/resources/content/msgHdrViewOverlay.js