I was able to replicate your issue on my test server. I then changed from jquery 1.3.2 to 1.4.1. With Jquery 1.4.1 it doesn't add the cache-breaking string.
<script type="text/javascript" src="jquery-1.4.1.min.js"></script>
Of course, using 1.4.1 might not be an option for you.
Brian Bolton
2010-01-28 21:00:10