The transistor is needed for level shifting and signal inversion. It can't be done any simpler than the diagram presented. Radio Shack has the transistor for 79 cents, Model: MPS2222ACool thanks I'll have to see if I can figure it now.
Do you have more info on this diagram, I'm not finding anything on google, was looking for something that didn't involve the transistor I haven't yet been able to find one in all my stuff. I do have the resistor though, a crap load of them.