Jcarousel doesnt work

<?php
    jcarousel_add('sweetie');
    drupal_add_js (
      '$(document).ready(function(){
         $("ul.carousel-cars").jcarousel({
           scroll: 1,
           auto: 2,
           wrap: "last"
         });
}); ',
      'inline');
?>
 

<ul id="carousel-cars"  class="jcarousel-skin-ie7">
<li><a href="http://example.com" target="_blank"><img src="/files/couloir_slideshow1/1.jpg" border="0" width="80" height="45" /></a></li>
<li><a href="http://example.com" target="_blank"><img src="/files/couloir_slideshow1/1.jpg" border="0" width="80" height="45" /></a></li>
<li><a href="http://example.com" target="_blank"><img src="/files/couloir_slideshow1/1.jpg" border="0" width="80" height="45" /></a></li>
<li><a href="http://example.com" target="_blank"><img src="/files/couloir_slideshow1/1.jpg" border="0" width="80" height="45" /></a></li>
<li><a href="http://example.com" target="_blank"><img src="/files/couloir_slideshow1/1.jpg" border="0" width="80" height="45" /></a></li>
<li><a href="http://example.com" target="_blank"><img src="/files/couloir_slideshow1/1.jpg" border="0" width="80" height="45" /></a></li>
</ul>

I made a jcarousel with this code in the page and the jcarousel doesnt work. I erased de div container because doesnt works. I dont know what happend. Can you help me.