centering webpage using css..

cud someone tel me how do i center my webpage using css. The problem s I've used frames, is it possible to center the frameset (page) so dat it looks same on a 17" moniter as wel as 15". One of the queries is similar but I dint quite get it.:confused:

There are lots of whats to center the page if you are using a frame, then maybe you should create a container div, and then set its text align to center and place the frame inside that?