+3  A: 

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
Crap. We're stuck with 1.3.2 for now, but we're early in the dev cycle - perhaps jQuery UI will be compatible with 1.4 soon and we can upgrade. Thanks for testing this out, much appreciated!
womp