function _vs_popup(url, wid, ht){
    var win;
    ht  = ht  || 600;
    wid = wid || 650;

    win = window.open(url, 'VSPOPUP', "toolbar=no,status=no,location=no,menubar=no,"+
        "resizable=yes,scrollbars=yes,height=" + ht + ",width=" + wid, 'yes');
    win.opener = self;
    win.focus();
    win.location = url;
}