jquery ajaxSubmit replaceTarget javascript

I have a div in this pattern:

<div id="register_container">


 ...
 <script type="text/javascript">
   $(document).ready(function()
    alert('hi');
    $("#customer").css("backgroundColor", "red");
    $('#add_item_form').ajaxSubmit({target: "#register_container", replaceTarget: true});
 </script>
</div>

The first run around I get a background color of red on the #customer select box and an alert. The 2nd...n times around I get an alert but开发者_JAVA百科 the #customer background doesn't change. It seems to be operating on the "Old" stuff. How can I fix this?

try

$("#customer").css("background-color", "red");