function ChangeDefaultSitelist(lastse, sitelist)
{
    var pos = 0;
    var indexlastse = '';

    if (sitelist.indexOf(lastse + ',') != -1) {
        indexlastse = lastse + ',';
        pos = sitelist.indexOf(indexlastse);
    // match at end.
    } else if (sitelist.indexOf(lastse) != -1) {
        indexlastse = ',' + lastse;
        pos = sitelist.indexOf(indexlastse);
    }
    var lead = sitelist.substring(0, pos);
    var rear = sitelist.substring(pos + indexlastse.length);
    var list = lastse + ',' + lead + rear;
    return list;
}