As your home theatre system only has 1 HDMI port and thats an output, you are going to need a optical cable from your PS3 to your theatre system, its the only way it will work.
So something like this should do the job.
http://www.cablechick.com.au/cables/...ink-cable.html
Offtopic: And I don't care what anyone says, unless you're an audiophile you don't need the best / most expensive cables ever!
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