Header is moving

[razor21]

Hey there!

ok, i've got a little problem going on...
once in a while when i press on one of my buttons in my menu's, my header is moving 1 px :look:

it's not that when i press a button to a certain page that the header is moving, just randomly...

I havent got the slightest idea why its acting like this, any of you do?

here a link to the Site (http://www.cmd.tech.nhl.nl/users/haar300/Site)

and here a screenshot (http://img215.imageshack.us/my.php?image=frickinheader6us.jpg)

Tnx for any tips and help

[skOOb]

i was clicking all over in firefox and it never messed up. were you using IE? does it correct itself if you click 'refresh?'

[razor21]

yes i also used Firefox and IE and the error shows up in both browsers...

sometimes u have to click many, many links and sometimes the error appears very quickly. and yes the header goes back to the correct position if u refresh or if u just click another link. But i just want to disable that little buggie