http://bugs.jquery.com/ticket/12421

style_functions.js

/*
 * IE 7-9 don't trigger the onchange event when the user uses autocomplete.
 * Extend the jQuery change event to fill in that trigger.
 */
(function($) {
  // Keep the old change function around for later
  var oldchange = $.fn.change;

  $.fn.change = function(handler) {
    
    // Register with jQuery to call the function like normal
    var result = oldchange.apply(this, handler);
    
    if(handler) {
      // Just for text boxes, call this special function on blur
      this.filter('input[type="text"]').blur(function(event) {
        $(this).change(event);
      });
    }
    
    return result;
  }
})(jQuery);