[jQuery] Using getJSON...not successful

[gms]

Hello,
I am new to JQuery.  I'm trying to get a JSON response back from my
django view.  However, I guess my data never gets loaded
successfully.  Does anybody know what I'm doing wrong?

<script>
$(document).ready(function(){
  $("#first").click(function(){
    $.getJSON("/mysite/myajax", function(data) {
      alert("Here");
    });
  });
});
</script>

////
def myajax(request):
    a = Testimonial.objects.all()[:3]
    response_dict = {}
    response_dict.update({'a': a})
    return HttpResponse(simplejson.dumps(response_dict),
mimetype='application/javascript')

///////////

Whenever I access this page and click on my div that contains the id
'first'...nothing happens.  I should see an alert that says 'Here'.

Any Suggestions on what I'm doing wrong?

Thanks