How to Align logo and ads underneath

Hello,

You've all been very helpful to me in this forum, just want to say thanks!

I was finally able to add the widgets to my header. But I'd like to center align the logo and then have the 2 banner ads underneath it side by side. I'm using Simple Image plugin, btw.

Can you please tell me what code I need to add?

Here's my url: http://gator541.hostgator.com/~acoc2011/

Many thanks, again!

Eunice