CSS, centering links inside div
Wrap the links in another <div style="width: 300px; margin: 0 auto;">
to group them together.
http://jsfiddle.net/NcEpe/1/
Edit for dynamic widths: http://matthewjamestaylor.com/blog/beautiful-css-centered-menus-no-hacks-full-cross-browser-support
If you need shrinkwrapped centering, apply inline-block
on the things you want centered. Then text-align:center;
on the parent.
You'll need to probably have a workaround for IE, but as you haven't posted code I won't go into that.