function Go (select)
{
    var wert = select.options[select.options.selectedIndex].value;
    if (wert == "leer") 
    {
        select.form.reset();
        parent.frames["unten"].focus();
        return;
    } 
    else 
    {
        if (wert == "ende")
        {
            top.location.href = parent.frames[1].location.href;
        }
        else
        {
            parent.frames["unten"].location.href = wert;
            select.form.reset();
            parent.frames["unten"].focus();
        }
    }
}