Whole Website moves on mouseover

I have the following problem:
We use the tooltip gc on our Joomla! 2.5 Website:
bfp-treuhand.de/joomla/d/unternehmen/unternehmen/team

When you test it you will see, that the whole website moves or jumps a bit.
Why that? Have you a solution for that?
(The site jumps only when you have opened both tooltips)

I hope you can help me.

Hi
the first word to start a discussion would be "hello" ...
For your problem, the tooltip is so high that when it comes from the bottom of the page, the page get higher during few milliseconds
change the tooltip height or put more content into your page at the bottom
CEd

Hello,

sorry - I was in hurry and forgot to say hello - you are right, normally I start a discussion with that .

Thanks for your help. The problem was really the scrollbar. Everytime the toolbar comes from the bottom, the whole site got a scrollbar on the right site. And the whole website jumped a bit to the left and back again.

So I decided to show the scrollbar everytime.
My solution for that is:

Thanks a lot!