function korrig()
{
    var b;
    for(var n=0; n<5; n++)
    {
        var k=2*n;
        var l=k+1;
        var a = window.document.forms[1].elements[k].selectedIndex;
        var i = window.document.forms[1].elements[k].name;
        i = parseInt(i);
        if(i==a)
            b = "richtig";
        else
            b = "falsch";
        window.document.forms[1].elements[l].value=b;
    }
}