add: return undefined; 
context: function WSM_LookupElement( element, lookby, property ){  for(var i in this.PageData )  {    for( var j in this.PageData[i] )    {      if(!lookby)         lookby = "id";    // search by id by default      if( j[lookby] == element && !property )        return j;      else if( j[lookby] == element ) {        var container = [];        for( var k = 0; k < property.length; k++ )        {          container[k] = this.PageData[i][k][property[k]];        }        return container; // only support one single match per hash just now      }    }  }}
meta: 5459	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5459/497865db29faa5d412b95875ce40aa06559c2494/widgetStateManager.js/clean/xpfe/global/resources/content/widgetStateManager.js