Different image banners on the different post/pages of the WP sidebar

How can I put at my WP blog's sidebar, different image banners on the different post/pages related to the page.

For example I want for my site: www weddingspeechespro com

In the above site, I have different posts like: Father of the Bride Speeches, Maid of Honor Speeches, Best Man Speeches. So I want to display Father of the Bride Speeches banner ad on the Father of the Bride Speeches post and Maid of Honor Speeches banners at the Maid of Honor Speeches post pages's sidebar.

What will the code for this?

Pls help me.