slideToggle stopped working in IE 9

slideToggle stopped working in IE 9

Hi,

I've had no problems until I upgraded to IE 9.  I'm running jquery 1.4.4 and also tried it with the newest version.  In IE 9, it will work if I switch the browser to IE 8 Standards Mode.  When I switch it back to IE 9 Standards it stops working.  By stop working I mean I click on the button and nothing happens.

Here is the javascript:

 
  1.  jQuery.noConflict(); 
  2. var $j = jQuery; 
  3. $j(document).ready(function () {
  4.  $j('div.menu_class').click(function () {
  5.  $j('ul.the_menu').slideToggle('medium');
  6.  });
  7. });

Here is the html:

 
  1. <div id="button" class="menu_class">
  2.  <ul class="the_menu">
  3.  <li><a href="/houston.html">Houston</a></li>
  4.  </ul>
  5. </div>

Here is the CSS:

  1. #button {
  2. height: 32px;
  3. width: 184px;
  4. margin: auto;
  5. background-image: url(button.png);
  6. background-repeat: no-repeat;
  7. background-position:0 0;
  8. position:absolute;
  9. left: 499px;
  10. top: 71px;
  11. color:#FFF;
  12. font-size:20px;
  13. font-weight: bold;
  14. text-align:center;
  15. line-height:32px;
  16. z-index:1;
  17. }
  18. #button ul, li {
  19. margin:0;
  20. padding:0;
  21. list-style:none;
  22. }
  23. .menu_class {
  24. border:1px solid #1c1c1c;
  25. cursor:pointer;
  26. }
  27. .the_menu {
  28. display:none;
  29. width:184px;
  30. border: 1px solid #1c1c1c;
  31. font-size:14px;
  32. text-align:left;
  33. line-height:16px;
  34. z-index:1;
  35. position:absolute;
  36. top:33px;
  37. left:0;
  38. }
  39. .the_menu li {
  40. background-color: #302f2f;
  41. margin:0;
  42. padding:0;
  43. list-style:none;
  44. display:block;
  45. float:left;
  46. width:100%;
  47. }
  48. .the_menu li a {
  49. color:#FFFFFF;
  50. text-decoration:none;
  51. padding:10px;
  52. display:block;
  53. }
  54. .the_menu li a:hover {
  55. padding:10px;
  56. font-weight:bold;
  57. color: #F00880;
  58. }

Any ideas on what the problem could be or how to fix it?

Thanks,

Tim