Jquery Checkbox change event not firing
===

   Am trying to sortout this small issue from past hour :



    <script type="text/javascript">
    $(document).ready(function(){		 
	    $("input[name='isClubMember']:checkbox").mousedown(function() {
    		 if (!$(this).is(':checked')) {
       		 	this.checked = confirm("Are you sure?");
        		$(this).trigger("change");
   			 }
       	});
     });
    </script>

Funnily this works in JSFiddle ..but not in my jsp page.
[Sample][1]

The above code gives me `null` error at this line (in Debug console)

     $("input[name='isClubMember']:checkbox").mousedown(function() {

JQ -Ver : 1.7.2 Browser : IE8

  [1]: http://jsfiddle.net/JXbYt/