IE7 - Element Width is Wrong After Javascript Fade-In?

[eluser]Vik[/eluser]
I have a page with a 3-column layout. When a link is clicked, the middle column is supposed to slide up via Javascript, have its text replaced, and then fade in. This works perfectly in Safari, Firefox 2 and Firefox 3, but on IE7, the middle column fades in with a width that is less than half of what its CSS seems to provide for. I've put up a demo page here:

http://www.flavorzoom.com/anomalies/fade...omaly.html

What is causing this, and how can I fix it?

Thanks very much in advance to all for any info!