For surround sound off the DVD, you can ignore the TV. Just use a standard phono-plug coaxial cable to connect the digital out of the DVD player to the digital input of the amplifier which powers the speakers. Then wire up the speakers and position them.
I had an old Creative surround speaker system similar to the link I showed you, and it could take a coaxial digital input. But, looking at Creative's website just now, it's not obvious which of their kit has a digital input, so best ask in the shop.
At your budget, you'll only be able to afford that kind of setup, but they are pretty good value for money, the most expensive only being about €130.