Facebook Share using Open Graph?

How can you integrate the Facebook sharer using the JavaScript SDK?

I want to be able to share a nice big image once you press a button.

I tried assigning the code below to a clickable button but I had no luck!

https://www.facebook.com/dialog/feed?
  app_id=145634995501895
  &display=popup&caption=An%20example%20caption
  &link=https%3A%2F%2Fdevelopers.facebook.com%2Fdocs%2F
  &redirect_uri=https://developers.facebook.com/tools/explorer

thanks!