Need help with mod_rewrite and layout -> live vs localhost

[eluser]selman555[/eluser]
Hi all!

I'm having some trouble figuring out why the layout on my localhost (xampp) is different from my live version (www.tong-il-neeroeteren.be)

If you browse to www.tong-il-neeroeteren.be, you will notice that the title starts next to the menu instead of under it.
The menu appears to be lower then it should be...

Also, only the main page seems to load correctly. All links clicked result in an internal server error.
I have mod_rewrite enabled, so I take it it works up to some point...

Any advise you guys can give me?
Perhaps you can provide me with some links, so I can start learning whatever I'm doing wrong