public/javascripts/yui/datatable/datatable.js
function(index) {
    if(lang.isNumber(index)&& this._elColgroup) {
        var nextSibling = this._elColgroup.childNodes[index] || null;
        this._elColgroup.insertBefore(document.createElement("col"), nextSibling);
    }
}
function(index) {
    if(lang.isNumber(index)&& this._elColgroup) {
        var nextSibling = this._elColgroup.childNodes[index] || null;
        this._elColgroup.insertBefore(document.createElement("col"), nextSibling);
    }
}
function ( index ) { if ( lang . isNumber ( index ) && this . _elColgroup ) { var nextSibling = this . _elColgroup . childNodes [ index ] || null ; this . _elColgroup . insertBefore ( document . createElement ( "col" ) , nextSibling ) ; } }
Adds a COL element to COLGROUP at given index.

@method _insertColgroupColEl
@param index {Number} Index of new COL element.
@private
Adds a COL element to COLGROUP at given index .