jQuery Error IE JSON
<p>when I run this JS in FF or Safari it works just right but in IE I get 'optionValue' is Null or not an Object.</p>

<pre><code>$(function() {
    $('#selectBrand').change(function(){
     $.getJSON('Scripts/ajax_busquedas.php', {idMarca : $(this).val() }, function(j) {
      var options = '';
      var i = '';

      for (i = 0; i &lt; j.length; i++) {
       options += '&lt;option value="' + j[i].optionValue +'"&gt;' + j[i].optionDisplay + '&lt;/option&gt;';
      }

      $('#selectCategory').html(options);
      $('#selectCategoy option:first').attr('selected', 'selected');
     });
    });
});
</code></pre>

<p>Any ideas on how I can start debugging this?</p>

<p>Thanks,
Max</p>
