javascript not working in IE6 only

[pixelita]

I've put a javascript-based Twitter badge on a client's web site. It looks fine in Opera 9.6 and Firefox 3. It won't run in IE6, however. Is this yet another limitation of IE? Here's the site:

http://www.guswortham.info

Here's the code (which I have implemented as a component in GS, BTW):

Code:

<script src="http://widgets.twimg.com/j/2/widget.js"></script>
<script>
new TWTR.Widget({
  version: 2,
  type: 'profile',
  rpp: 4,
  interval: 6000,
  width: 180,
  height: 200,
  theme: {
    shell: {
      background: '#eeeeee',
      color: '#004000'
    },
    tweets: {
      background: '#84a584',
      color: '#000000',
      links: '#ffffff'
    }
  },
  features: {
    scrollbar: false,
    loop: false,
    live: true,
    hashtags: true,
    timestamp: true,
    avatars: false,
    behavior: 'all'
  }
}).render().setUser('fogw').start();
</script>