Sorry i misread your post.
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You can do it,
You just need a
composite to vga converter, it looks like:
*www.virtualinformation.com/ebay_images/vga-1lg.jpg
Then all you have to do it is connect the vga side into your computer monitor and the output pin from your box into the in port of the cable.
*img99.imageshack.us/img99/562/block6xh.th.png
Forgive the bad imaging