IE7 / Firefox behavior discrepancy (probably easy fix)

IE7 / Firefox behavior discrepancy (probably easy fix)

Hi all, I have some fairly simple JQuery code and CSS involving incrementing a count inside a hidden div and then unhiding that div.

In my example the hidden div is at the bottom of the screen, to illustrate the incorrect behavior in IE7. Hard to explain, but it is simple code and just doesn't behave like it does in Firefox, nor how I'd expect.

A working example is here: http://pastehtml.com/view/090204eUJyrjIU

Is it CSS related? Surely it's not jQuery...

Thanks in advance for any help =)