How will i connect Xbox 360 VGA HD AV Cable to my PC speakers?

i have PC Speakers which have 2.5 mm jack and they dont have any ports for those audio cables which comes with Xbox 360 VGA HD AV Cable set.

i am asking this bcz i am going to connect my Xbox360 to my PC monitor for getting the HD resolution through Xbox 360 VGA HD AV Cable.

so what should i do.is there anyway or any device to connect it to my speakers .

can anyone tell me.


thank you .