How do you put a photo behind a javascript? [For tumblr bloggers who uses twitter status codes :)]?

[Mocha]

Ok so, I've been tweaking around my tumblr blog lately and I'm having problems putting a background photo behind a twitter status.

Here's the code:
<div id="textLink"><br>
<div id="twitter_div">
<div align=center>
<font size="1">
<ul id="twitter_update_list"></ul>
</div>
<center><script type="text/javascript" src="http://twitter.com/javascripts/blogger.js"></script>
<script type="text/javascript" src="http://twitter.com/statuses/user_timeline/heyitsmocha.json?callback=twitterCallback2&count=1"></script></center>
</font></div>
</center><br>
</div>
</div>

What I want to do is to put this code: <img src="http://img855.imageshack.us/img855/5286/47674559.jpg"> inside the javascript so the twitter status will look like it has a background photo or something like that. Please help?

[wokan]

<style type="text/css">
#twitter_div {background-image:url('http://img855.imageshack.us/img855/...');}
</style>