HT4859 how can i get back all music, app after sync the iphone on another computer using his apple id

i have plug my iphone on another computer and backed it up but was signed on with my friend apple ID so now all music, app etc which were on my iphone as been replace by his one how can i restore to its previous content knowing i cannot use the laptop anymore which is the one i used to backup mine with
please help

If you have not backed up or copied your photos to a PC/Mac
A restore wipes the iPhone clean ,there is no way to recover
http://support.apple.com/kb/HT1766
and here
http://support.apple.com/kb/HT4946

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