onclick form submit

<script>
    <!--
    //
     var detik=20;
     var menit=1;
     //document.counter.d2.value='30'

    function display()
    {
        if (menit==0&&detik==0) {
            alert('Waktu habis');
            document.getElementById('form1').submit();
        }

     if (detik<=0){
        detik=60;
        menit-=1;
     }
     if (menit<=-1){
        detik=0;
        menit+=1;
     }
     else
        detik-=1

        detik="" + detik
        menit="" + menit
        var pad = "00"
        document.getElementById("menit").innerHTML=pad.substring(0, pad.length - menit.length) + menit;
        document.getElementById("detik").innerHTML=pad.substring(0, pad.length - detik.length) + detik;
        //document.counter.d2.value=menit;
        //document.counter.d3.value=detik;
        setTimeout("display()",1000)
    }
    display()
    -->
    </script>