function doCalc()
{
 var frm = document.forms['detox'];
 var cnt=0;
 for (i=0;i<frm.length;i++) {
  if (frm.elements[i].type=='checkbox')
  {
    if(frm.elements[i].checked)
    cnt++;
  }
 }
 cnt*=4;
 var res=document.getElementById('result');
 res.value="Your score is "+ cnt;
 //alert('your score is' + cnt);
}