Tabs widget and IE7

Hi,
I've created a Tabs and I put it in a html Table. The table is not
hidden and at page loading I animate it. But I get a different
behaviour in FF and IE 7. (it works fine in FF).
Here's the sample : http://www.metrica.net/diy/Default.aspx
As you can see, in IE7, the Tabs are shown right away instead of being
shown progressively with the animation.
Can you help ?