iPhone transferring purchases to another computer ? HELP

hi folks,

My mate has an itunes account and he had quite alot of applications which he installed on my iPhone. Now I wanted to put more songs on it using itunes on my computer but it says that " Marks iPod" is synced to another PC and then only gives an option to cancel or erase..

I dont want to loose the application, I could make an account but he has put quite alot applications which he had paid for..

done the search on google but nae luck..

please please please, someone help..

try changing the name of the fone
or if j/broken, use uuid generator to change your personal uuid, also handy when downloadin cr#ked apps

or use dtunes