here's a website for you:

http://www.gefen.com/kvm/products/dvi_extension.jsp

the first product on that page works as a sender and repeater to send a DVI signal over long distances using a CAT-5 cable. It should do the trick...

Ok...just read the price...umm...it may be a little pricey...

Option #2:
http://www.gefen.com/kvm/product.jsp?prod_id=1207

A bit cheaper option but it may require the use of a second cable.

Keep us posted on the results. I have a D2 also and may run into the same exact issue.