How do i center the whole page

[Delk]

Currently my photo gallery is justified to the right, how do i get it centered?    Here is a link to my gallery so you can see what i mean http://www.graphicdesignsplus.com/gallery

Also if you could tell me why my rollover links dont work with the header i put in there, that would be great, but most importantly i need to know how to get the page centered.

Thanks! 

[Hein Traag]

Depends on what theme you are using. Usually there is a css style sheet in which you can adjust these things. Have you looked at that?

[Joachim Müller]

The table nesting of your template appears to be incorrect. Validation fails with an awfull load of errors. Fix that first.