function countCheckboxes () {
     var form = document.getElementById('testForm');
	 var count = 0;
	 for (var n=0;n < form.length;n++){ 
          if(form[n].name.substr(0,7) == 'chkbox_' && form[n].checked){
            count++;
          }
        }
        document.getElementById('checkCount').innerHTML = count * 1;
 	}
	window.onload = countCheckboxes
 
function countCheckboxes2 () {
	var form = document.getElementById('testForm2');
	var count2 = 0;
	 for (var n=0;n < form.length;n++){ 
          if(form[n].name.substr(0,7) == 'chkbox_' && form[n].checked){
            count2++;
          }
        }
        document.getElementById('checkCount2').innerHTML = count2 * 2;
 	}
	window.onload = countCheckboxes2