var err_message = "";
    var err = false;
    var form = "";

    function check_radio(field_name, message) {
      var isChecked = false;

      if (form.elements[field_name]) {
        var radio = form.elements[field_name];

        for (var i=0; i<radio.length; i++) {
          if (radio[i].checked == true) {
            isChecked = true;
            break;
          }
        }

        if (isChecked == false) {
          err_message = err_message + message + "\n";
          err = true;
        }
      }
    } 

    function verifyForm(form_name)
    {
      err = false;
      form = form_name;
      err_message = "Please answer the following questions:\n";

      check_radio("A1", "Question 1");
	  check_radio("D2", "Question 2");
	  check_radio("B3", "Question 3");
	  check_radio("A3", "Question 4");
	  check_radio("B1", "Question 5");
	  check_radio("A2", "Question 6");
	  check_radio("C1", "Question 7");
	  check_radio("B2", "Question 8");
	  check_radio("C2", "Question 9");
	  check_radio("C3", "Question 10");
	  check_radio("D1", "Question 11");
	  check_radio("D3", "Question 12");	  

            if (err == true) {
        alert(err_message);
        return false;
      } else {
        submitted = true;
        return true;
      }
    }