How do I restore the iPhoto delete warning?

[fivepoint]

Whenever I used to delete photos in iPhoto, it would first give me a warning... something to the effect of "are you sure you want to do this?" At some point, I lost this (I'm assuming I clicked "always skip" or something like that) warning so now, when even I unintentionally click delete... there's no hesitation... they're just gone.

Does anyone know how to restore this important warning "double-opt-in" type button?

THANKS!

 

[BaldiMac]

I don't recall ever getting a warning. It should just move the photos to iPhoto's trash.