Sociable Plugin Problems!

I’m having problems with the sociable plugin for my site.

Here’s my site: http://www.EndAllDisease.com
Here’s the problem: Everytime you click ‘like’ on facebook, it seems to be picking the wrong picture to represent the post, so you end up with a picture that has nothing to do with the article posted on a person’s FB page.

It doesn’t sell it at all, and I think deters people from clicking ‘like’.

Instead of the photo associated with the post it usually uses one of the banners I have in my sidebar.

I would love some help to make the plugin find the photo in the actual post.

Regards,
-Markl