HDMI to DVI-D cable with 360, how do I get sound?

I just bought a gateway hd2200 22' monitor and im expecting it to arrive either today or tomorrow hopefully. It has every video input option... component, hdmi, dvi, vga; and said it supported 720p. I was going to use Hdmi since the monitor had an audio output for hdmi.Then after i ordered it, I read this on gateways product page

"720p HD through DVI-D connection with HDCP DCDi by Faroudja for enhanced video processing picture in picture and soft PIP (dynamic, adjustable and transparent.)"

So im guessing HDMI won't be as good an option as a HDMI to DVI-D cable. The only problem is, how in the world do I get sound with that connection???

Here is the monitors description page if you need more details on it

http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=3872477&CatId=2775

http://www.gateway.com/retail/hd2200.php