单选按钮验证不适用于IE

Question

I have following code which validate the questionnaire form and post answers on the next page if all the required answers are entered by the user. This code works perfectly on the Chrome and Other browsers except IE(internet explore). It shows the alert message "Answer All Question" even selecting options all question. This thing is happening only in IE.. Can someone tell me why its behaving like this?

<script type="text/javascript">

//---------------Method for validating the Question whole form --------------//
function checkRadio(name)
{
  var radio = document.forms.myForm[name];
  for (var option in radio)
  {
    if(radio[option].checked)
    { return true; }
  }
  return false;
}

function ValidateQuestions()
{
  if (checkRadio("question1") && checkRadio("question2") && checkRadio("question3") && checkRadio("question4") && checkRadio("question5") && checkRadio("question6") && checkRadio("question7") && checkRadio("question8") && checkRadio("question9") && checkRadio("question10") && checkRadio("question11") && checkRadio("question12") && checkRadio("question13") && checkRadio("question14") && checkRadio("question15") && checkRadio("question16") && checkRadio("question17") && checkRadio("question18") && checkRadio("question19") && checkRadio("question20") ) 
  { return true; }
  else{ return false; }
}

//-----------------------------------------------------------------------------//

jQuery(document).ready(function($) 
{    
    jQuery('#submitFormC').click(function()
    {
     var str = $("#questionnaireForm").serialize();
     var data = {
                 action: 'myajax-submit',
                 s: str,
                 beforeSend: function(){ 
                    $( "#tab" ).empty();
                    $("#tab").append("<img id='busyImg' src='busy.gif'/>");
                    }
                }; 

        if(ValidateQuestions())
        {
        jQuery.post("thankyou.php?t=<?php echo $sid;?>", data,  function(response) { 
        //alert('Got this from the server: ' + response);
        $( "#tab" ).empty().append( response );
        } );
        }
        else { alert("Answer all questions"); }
     return false;   
    });
});
</script>

Answer 1

Try this: Fiddle: http://jsfiddle.net/eNt3c/4/

function checkRadio(name)
{
       if($("input[name='"+ name + "']").is(':checked'))
       { return true; }
        alert("Please select " + name);
        return false;
}