HELP! get sound from ps3 using optical

[stow123]

Ive got a philips lx3750w_25s reciever manual here

http://www.p4c.philips.com/files/l/l...5s_dfu_eng.pdf

Im using the optical connection to try and get sound to it from my ps3 so i can play motorstorm in dolby digital 5.1 etc ive choosen optical on the ps3 sound settings ticked all the boxes ive picked bitstream on the ps3 ive also gone into the recievers menu and picked ALL for all digital connections also selected the source its saying AUX/DIGI and ive got nothing.Can you get in and out for optical as im thinking my reciever could be optical out and if the ps3 is optical out too then that might be the problem? What would i do then can i get a coaxial to optical lead as the reciver has coaxial in.