Get facebook to show my Product images

This should be a very simple quick project. I have my OScommerce site running with a facebook "share button" on the product page. The share button works fine, and facebook picks up the product title and the website name etc, but the images it finds are from the column_left and column_right and the [login to view URL] files. It does not pick up the product image from the [login to view URL] file, which is the main image for the product. I have magiczoom installed on the product image page, so maybe this is where there is a conflict. I think it has something to do with the meta tages on the [login to view URL] page. SO, Get the facebook share link to see the image on the [login to view URL] page. Regards