cjdelphi:
and here's a video of it ... You're going to have to replace a couple of Resistor Values, to match what your setup requires, eg your voltage, how powerful the laser is to light it, how bright you want your LED, etc.
Holy crap man. You whipped that up pretty quick! THANK YOU SO MUCH! 
That's almost exactly what I wanted!
Is there any way to make the LED stay on if I have a 3.7V battery in the circuit somewhere?