rem: return kids[idx] 
add: return kids[idx] 
context:   getColumnAt: function(aIndex)  {    var idx;    var kids = this.mColGroup.childNodes;    if (aIndex == -1)      idx = kids.length-1;    else {      // step by 2 to skip over splitters, if they are used      var step = this.mSplitters ? 2 : 1;      idx = aIndex*step;    }    return kids[idx]     },
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/0b2dd2b2d2fd037df917e07645fa019a963332a5/inTreeTableBuilder.js/clean/extensions/inspector/resources/content/jsutil/xul/inTreeTableBuilder.js