Post Picture with Feed dialog on Facebook

I would like, in my app, to share a picture on my wall to show to all my friends. (Like if I was posting a photo on facebook).

I'm trying to use the feed dialog but I think i'm doing it wrong.

    FB.ui({         method:    'feed'        ,name:      'Look at my picture !'        ,link:      'https://www.facebook.com/link_to_app'        ,caption:   "Application title"        ,source: "http://icanhascheezburger.files.wordpress.com/2009/03/funny-pictures-kitten-finished-his-milk-and-wants-a-cookie.jpg"    }

So how can I publish a picture on my wall?