I'm having a bit of trouble with a page I'm working on. The page loads differently in the different browsers, and when it loads ( when you click on a button and continue further in to the site) it sort of bumps a little, and then it jumps back in to place. In firefox it doesn't happen at all, in chrome it happens about every fourth click, and in IE it happens every time. Is there a way to fix this ?

Here's the site, so that you might understand what I'm talking about.

In advance thx. =)