(Pic included) Please tell me why my home audio system wont work.?

I have a Samsung HDTV LN40A550 Samsung DVD/Surround system HT-Z310 And a PS3 Currently I am just using only HDMI cables between the surround sound and PS3 and there is no surround sound at this time. I have included a picture of this setup below. I also have included a picture of a setup I think will... show more I have a Samsung HDTV LN40A550
Samsung DVD/Surround system HT-Z310
And a PS3

Currently I am just using only HDMI cables between the surround sound and PS3 and there is no surround sound at this time. I have included a picture of this setup below.

I also have included a picture of a setup I think will work.

Could you please check out the picture and tell me why the top picture wont work and why the bottom picture will work.

Why cant I get sound by using only HDMI cables?

http://img5.imageshack.us/img5/9618/surrondhookup.png
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