HOW TO CALL SOMEONE WITH THE IPHONE BY JUST DOUBLE CLICKING THE HOME BUTTON?

I had a initial era jailbroken iphone and there was an app which let you allot roughly anything you longed for to the stand in click home button. I had it set to call my wife. Now I have the 3g iphone, additionally jailbroken, and I cant recollect what the app is called. Please help!