Hover CSS image is not working

For some reason my hover and current state are not working whenever I rollover or click the static image. Can someone please tell me what is wrong with my code? Thank you!

<!--CSS Code-->
<style type='text/css'>
    a.current { 
 background-image: url (images/aa_on.png); 
 background-repeat: no-repeat; }

 #nav a:hover {
background-image: url (images/aa_on.png); 
background-repeat: no-repeat;}
<!--JavaScript Code-->
<script type='text/javascript'>
$('#nav a').click(function(e) {
    var panel = $(this).attr('href');
    $("a", $(this).parents("li").siblings("li")).removeClass("current");
    // show slide
<!--HTML code-->
<td><ul id="nav" style="list-style-type: none; margin: 0;
 padding: 0;">
<li><a href="#panel2"><img src="images/aa_off.png" border="0" alt="About ASD" style="display:block;"></a></li>
<div id="panel2" class="panel">This is panel 2</div>

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Are you using any specific javascript library with this such as jQuery?  If so, which version?  In your HTML code, you might try moving id="nav" to the li tag instead of the ul tag.
<li id=nav">

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Chris StanyonWebDevCommented:
Your code is working fine - the problem you have is that your <a> tag contains an image. You try to change the background-image of the <a> tag when it's hovered or current and the background image sits behind the actual image so you don't see it. Remove the <img> from your <a> and you'll see it's working fine.

You can see it working here: http://jsfiddle.net/ChrisStanyon/8tepfpum/

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