Problems with website on higher resolutions

[David16k]

I'm having some problems with my website.
TweakVista.tk

The website works fine on 1024x768, but the page doesn't go to the center when using higher resolutions.

I'm using the design mode in Dreamweaver MX 2004.

How can I keep the website centered?

 

[Javi]

Change your CSS positioning from absolute to relative.