How do I center align adsense ads?

Hi,

I have a site coded in xhtml/css, where I use the 468x60 adsense banner.

Immediately below the adsense banner is a h2 heading

I would like the adsense ad to center align. I used

But with this, the h2 heading wraps around the adsense banner.

How do I fix this problem?

Any suggestions would be greatly appreciated.

Thank you,
Ellora. WordPress ...