function zeigMenue(welches)
{
        document.getElementById("products_menue1").style.display="none";
        document.getElementById("products_menue2").style.display="none";
        document.getElementById("products_menue3").style.display="none";
        document.getElementById("products_menue4").style.display="none";
        document.getElementById("products_menue5").style.display="none";
        switch (welches)
        {
        case '1':
                document.getElementById("products_menue1").style.display="block";
                break;

        case '2':
                document.getElementById("products_menue2").style.display="block";
                break;
        case '3':
                document.getElementById("products_menue3").style.display="block";
                break;
        case '4':
                document.getElementById("products_menue4").style.display="block";
                break;
        case '5':
                document.getElementById("products_menue5").style.display="block";
                break;
        default:
        }
}