Projector help?

[Andy_con]

ok i want to buy a projector to do this -

http://www.techeblog.com/index.php/tech-gadget/video-laser-tag

now i dont know much about projectors? do all projectors work with computers?

or do i need a special projector.
i want the cheapest projector i can find

http://cgi.ebay.co.uk/1600-LUMENS-H...ryZ22610QQssPageNameZWDVWQQrdZ1QQcmdZViewItem