Xbox 360 + Monitor help

Im thinking about connecting my 360 to my computer monitor and i knowhow to plug it up except for the sound. there is no sound port on my monitor. so what do i do? thanx for help

I use this,

http://www.tigerdirect.ca/applications/SearchTools/item-details.asp?EdpNo=2825463

Scroll down and it shows you the connections which includes a speaker jack. It works great. You can also have cable tv on it with a picture in picture function. I use it for PS3 but I doubt there would be a difference for 360.