function chgOpts()
{
    var level = document.forms.rubrikenform.Titel;
    var parent = document.forms.rubrikenform.Rubrik;


    for (i = level.length; i > 0; i--)
    {
        level[i]=null;
    }

    var opt = new Option("-bitte auswählen-","");
    level.options[0] = opt;

    var wert = parent[parent.selectedIndex].value;

    if (wert)
    {
        var arr = modelle[wert];
        if (arr)
        {
            var ln = arr.length;

            for (i=0; i < ln; i+=2)
            {
                optvalue = arr[i+1];
                optname = arr[i];
                var opt = new Option(optname, optvalue);
                level.options[level.options.length] = opt;
            }
        }
    }

    level.selectedIndex = 0;
    
    return;
}