Help with Facebook APP's image

Hello,

I had FINALLY created my very first app..(god I feel great!)
But.. now the hardest part that comes..
The traffic
My app is viral.. but... I have a problem
When I try to publish it to my Facebook Page.. it gives this http://img845.imageshack.us/img845/4526/noimagei.jpg

I want to be WITH IMAGE when I paste my app..
please guys.. share any ideas how to do it
because guys.. people do not click on links without images ;(

Regards,
Simeon