[SOLVED] How to add a banner ad ABOVE the header area?

My client wants to add a wide banner ad above her header. Currently it's top nav bar, header, cat nav. The ad would be above everything outside the wrap of the body. Would this be considered an add on bar or widget area? It would need to be centered above everything.

I did search the forum but found nothing that actually answered my question.

Here is the site: http://musingmainiac.com/