nilai

<script language="JavaScript">
function getNilai(ch){
  var n=document.getElementsByName(ch);
  var nilai=0;
  for(var i=0;i<n.length;i++){
    if(n[i].checked){
      nilai=parseInt(n[i].value);
    }
  }
  return nilai=='undefined'?0:nilai;
}

function calculateTotal()
{
  var ch1,ch2,ch3,ch4,hasil,total;
  ch1=getNilai('ch1');
  ch2=getNilai('ch2');
  ch3=getNilai('ch3');
  ch4=getNilai('ch4');
  total=ch1+ch2+ch3+ch4;
  document.forms[0].total.value=total;
  hasil=total/4;
  document.forms[0].nr.value=hasil;
  if(hasil<50)
    ket="TIDAK LULUS";
  else if (hasil<60)
    ket="DABLEK";
  else if (hasil<70)
    ket="CURANG";
  else if (hasil<85)
    ket="BAIK";
  else if (hasil<=100 && hasil>=85)
    ket="AAMAT BAIK";
  else
    ket="Input Salah >> 0-100";
  document.forms[0].nh.value=ket;
}
</script>
<form name="form" action="jssimpan.php">
<table border="1" cellspacing="0" cellpadding="3">
        <tr>
                <td bgcolor="#FFFFFF" colspan="3" align="center"><strong>Form Nilai</strong></td>
        </tr>
        <tr>
                <td><strong>Nama</strong></td>
                <td><b>:</b></td>
                <td><input name="TxtNama" type="text" size="12" maxlength="5"></td>
        </tr>
        <tr>
                <td><strong>Kelas</strong></td>
                <td><b>:</b></td>
                <td><input name="TxtKelas" type="text" size="12" maxlength="5"></td>
        </tr>
        <tr>
                <td>Nilai 1</td>
                <td><b>:</b></td>
                <td><input name= "ch1" type='radio' value="10" onClick="calculateTotal();">10
                <input name="ch1" type='radio' value="15" onClick="calculateTotal();">15
                <input name=ch1 type='radio' value="20" onClick="calculateTotal();">20
                <input name=ch1 type='radio' value="30" onClick="calculateTotal();">30
                <input name=ch1 type='radio' value="40" onClick="calculateTotal();">40
                <input name=ch1 type='radio' value="50" onClick="calculateTotal();">50
                <input name=ch1 type='radio' value="60" onClick="calculateTotal();">60

                </td>
        </tr>
        <tr>
                <td>Nilai 2</td>
                <td><strong>:</strong></td>
                <td><input name="ch2" type='radio' value="10" onClick="calculateTotal();">10
                <input name="ch2" type='radio' value="15" onClick="calculateTotal();">15
                <input name=ch2 type='radio' value="20" onClick="calculateTotal();">20
                <input name=ch2 type='radio' value="30" onClick="calculateTotal();">30
                <input name=ch2 type='radio' value="40" onClick="calculateTotal();">40
                <input name=ch2 type='radio' value="50" onClick="calculateTotal();">50
                <input name=ch2 type='radio' value="60" onClick="calculateTotal();">60
                </td>
        </tr>
        <tr>
                <td>Nilai 3</td>
                <td><strong>:</strong></td>
                <td>
                        <input name="ch3" type='radio' value="10" onClick="calculateTotal();">10
                        <input name="ch3" type='radio' value="15" onClick="calculateTotal();">15
                        <input name="ch3" type='radio' value="20" onClick="calculateTotal();">20
                        <input name="ch3" type='radio' value="30" onClick="calculateTotal();">30
                        <input name="ch3" type='radio' value="40" onClick="calculateTotal();">40
                        <input name="ch3" type='radio' value="50" onClick="calculateTotal();">50
                        <input name="ch3" type='radio' value="60" onClick="calculateTotal();">60
                </td>
        </tr>
        <tr>
                <td>Nilai 4</td>
                <td><strong>:</strong></td>
                <td><input name="ch4" type='radio' value="10" onClick="calculateTotal();">10
                        <input name="ch4" type='radio' value="15" onClick="calculateTotal();">15
                        <input name="ch4" type='radio' value="20" onClick="calculateTotal();">20
                        <input name="ch4" type='radio' value="30" onClick="calculateTotal();">30
                        <input name="ch4" type='radio' value="40" onClick="calculateTotal();">40
                        <input name="ch4" type='radio' value="50" onClick="calculateTotal();">50
                        <input name="ch4" type='radio' value="60" onClick="calculateTotal();">60
                </td>
        </tr>
        <tr>
                <td><strong>Total Semuanya</strong></td>
                <td><b>:</b></td>
                <td><input name="total" type="text" size="20" maxlength="30" value="" readonly>
                <input type=hidden name=hiddentotal value=0></td>
        </tr>
        <tr>
        <td><strong>Rata-Rata</strong></td>
        <td><b>:</b></td>
        <td><input name=nr type="text"  ></td>
        </tr>
        <tr>
                <td><strong>Kualitas Nilai</strong></td>
                <td><b>:</b></td>
                <td><input name=nh type="text"></td>
        </tr>
        <tr>
                <td>&nbsp;</td>
                <td>:</td>
                <td><input  type="button" value="hitung" onclick="x" ><input name="reset" type="reset">
                </td>
        </tr>
</table>
</form>