rem: while (aEl.childNodes.length) 
add: while (aEl.hasChildNodes()) 
context:   clearChildren: function(aEl)  {    while (aEl.childNodes.length)      aEl.removeChild(aEl.lastChild);  },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/26cdb24398282987c2afbd83349e8203022ac384/inTreeBuilder.js/clean/extensions/inspector/resources/content/jsutil/xul/inTreeBuilder.js