So, i made this design, and it ofc validates without errors:
[Valid] Markup Validation of http://local.pulse101.net/design1/ - W3C Markup Validator

Also the css validates:
W3C CSS Validator results for http://local.pulse101.net/design1/ (CSS level 2.1)

But if you first take a look in Firefox it looks like it should, but in IE 7 it is a total mess, which means i would have to implement IE hacks, which i really don't wan't to :(

If anyone have some ideas then i would appreciate it!

I nearly forgot the link: iACP - Intelligent Admin Control Panel

Because it validates doesn't mean that it should be working, your style logic needs to work out aswell. Maybe your logic is right yea. If it was about validation I could easily produce some IE only pages with valid XHTML/CSS ;)

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start developing on top of a reset stylesheet
i use yahoo's at: Yahoo! UI Library: Reset CSS

when i come to hacking so it works in old browsers, i find i have to do less stuff because everything started from the same values.

Resets don't always fix problems with layouts, they just provide you with a normalized base to work from... in a lot of cases, far more normalized than you need - it's almost like frameworks for CSS. Snazzy, but if you don't need the bloat, don't hop on the boat... er, bandwagon. IMHO.

Spyke, the problem with your page in this case is how IE's rendering your img... since the ID is part of the IMG itself and not a DIV that wraps it, IE feels the need to add some whitespace after itself. I would,

a) add a line break <br /> directly after your IMG element (on the same line in the file)
b) remove the ID from the IMG element and wrap the whole thing in a DIV with the same ID (will cause your border to render farther out, until you specify a new width, but will fix your whitespace problem)
c) modify your logic so that the border necessary to the menu is permanently attached to the menu (such as by adding a BORDER attribute to your UL#menu), which would also have the future benefit of allowing you to remove other elements without breaking that one.
d) get rich, buy Microsoft, and do us all a favour and discontinue internet exploder. :)

-m

Argh, internet explorer winds me up no end, it really is the bane of my very existence it.

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Well i fixed it by using a display: block; in the image, really weird :S