Macbook Pro - Mid 2009, optical audio?

I just bought Amazon.com: Cables To Go 27016 Velocity Toslink-to-Optical Mini Plug Digital Cable (2 Meters): Electronics in order to get audio from my pc when i connect it to my TV. I bought the Amazon.com: moshi MiniDisplay Port to HDMI Adapter with Audio: Electronics so i can get video, and i get video just fine, but im having problems getting the audio to work. Is the cable i bought for audio not the right one? or what do i have to do in order for it to work?

I guess ill just buy a Amazon.com: Cables To Go Velocity Right Angle Adapter - Toslink to Mini Plug (40017): Electronics and connect it to the PC in on my tv.