I just bought my Ipod yesterday and I couldn't set my background (except when i unlock it) so i searched here, and came to know that it is unpossible (quite stupid if u ask me) so, I'd really like this, but, what are the risks when i do this 'jailbreaking?' does it f*** up my ipod touch? can i restore it back to normal, what happends to my warranty when i do it? can someone give me some general info ? thanks alot bro's!