overlapping facebook share box

hello wp friends,
You may have notest the videos on facebook that people share. For watching the video you have to share it on facebook, that way the hits will be increased alot. I’m thinking of making something like that, though where I write article’s that people may seem intresting. Now i have to code the box that shows up and making sure that the person post it on facebook, and then close. Does anyone have an ideer how i should make that? also where i should place it in the coding? note that i’m using twenty eleven.

hope for some help, thanks.
– Knuth