rem: while (aEl.childNodes.length) 
add: while (aEl.hasChildNodes()) 
context:   clearChildren: function(aEl)  {    while (aEl.childNodes.length)      aEl.removeChild(aEl.lastChild);  },
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/4cba32786bcfe8ed3d92ee412e77e5d20b45181e/inTreeBuilder.js/clean/extensions/inspector/resources/content/jsutil/xul/inTreeBuilder.js