XF 1.5 Header overlapping body

[amagab]

I use a custom theme that I purchased from a developer. I then added an image above the header, but now the header overlaps the body.

This is the website: http://mynudies.com (jeansforum - no porn!)

As you can see, the header is overlapping the body where I have an adsense banner at the top. The developer hasn't responded to me yet.

Can someone help me fix?

Thanks!