Formative Test Form

<SCRIPT language="JavaScript" type="text/javascript">
 function checkFormativeTest(testForm, rightAnswer)
 {
   var choice;

   for(i = 0;i<testForm.elements.length;i++)
   {
     if(testForm.elements[i].checked)
     {
       choice = testForm.elements[i].value;
     }
   }

   switch(choice)
   {
    case undefined:
     alert("Please make a selection.");
        break;
        case rightAnswer:
     alert("'"+choice+"' is correct!");
        break;
        default:
     alert("'"+choice+"' is incorrect.");
   }

   return false;
 }
 </SCRIPT>

------------------------------------------------------------------------

Question?
<form method="POST" onSubmit="return checkFormativeTest(this,'B');">
  <input type="radio" value="A" name="">
  A. Answer A

  <input type="radio" value="B" name="">
  B. Answer B

  <input type="radio" value="C" name="">
  C. Answer C

  <input type="submit" value="Submit Answer">
</form>