Moody's eye/polyjuice

[hp_fan16]

No: HPFGUIDX 43729

ooh ooh ooh! I have a question!
 ok I know some have mentioned it before, but I'm still confused, and 
have so many questions. plus I hope this is a bit more specific than 
other threads, (though I'll understand if I'm cursed because it's not)

so...How Could Crouch Jr. have used Moody's magical eye? Could anyone 
with out an eye, have stuck it in their socket and would it have 
worked? Or was that because of the polyjuice that it worked, and if 
so why? if ploy juice can do that could you also give predictions if 
you were a polyjuiced-Trelawney? or would you be turn into a werewolf 
at full moons if you were a polyjuiced-Lupin? And I have one more, 
how did Moody acquire that 'magical eye' anyways? did he invent it, 
find/buy it, was he born that way? and, sorry I lied, but one more, 
Will Moody's eye still work for him, even though it was taken out of 
his socket? I'm just confused about the whole eye/polyjuice thing. 
How far does polyjuice work, and when and why does the eye?

Gabrielle~
who really seems to be writing a bit much lately~