Folded to the button who limps...

[manpower]

This seems to be something I'm seeing more and more often in the 2/4 game on party, I would post it anywhere else but i'm certain it's been done before and I just can't find the thread.

Anyway, you're in the sb or bb and it's folded to the button who limps, assume that if you raise the button will almost never fold, and that if the sb has completed he will also very rarely fold. What range of hands should we be raising with here out of the sb? bb? Any links to existing threads would be appreciated.