Hello! I have this question about my tumblr blog. I have this theme, and I placed ads on my blog.

Now the top of my blog looks like this:
http://oi61.tinypic.com/mikvgl.jpg

But, I want the posts to start at the top, not like under the advertisement, with blank space above it.

Does anyone know how to fix this?

Fyi, my url is: stardusttx.tumb lr.com

Thanks in advance....