function open_windows(sTipoOp) {
    var Ancho = screen.availWidth - 10;
    var Alto = screen.availHeight - 28;
    var features = "toolbar=no,status=yes,location=yes,directories=no,menubar=no,scrollbars=yes,top=0,left=0,width=" + Ancho + ",height=" + Alto + '"';
    //validar el navegador para el caso <n6
    //var SO = getOpSys();
    switch (sTipoOp) {
        case 0:
            var sPath = "Portfolio/Default.aspx";
            myWindow = window.open(sPath, 'bol_pe', features);
            break;
    }
}