Button bar?

i havent worked on making web pages in years, alot has changed. Which leads my to my question. It used to be easy to make a simple button bar with rollovers (centered on the page). My attempts have yielded about 80% success, with one problem.

I’ve got 3 “buttons” (with “rollovers”), side by side horizontally and i want that assembly centered on the page… it insists on being left justified in its column… spacing things out from the left doesnt seem to work very consistantly?

When i hit the center button, the images stack on top of each other… uh. what am i doing wrong? (i am a novice, be nice)

address of my progress so far - (www.sfostergraphics.com)