Extending My Windows Vista desktop

Hello,

First time for me in this forum so i hope i post i the correct place, if not please accept my appology in advance.
Right here goes with my question.

Im a Karaoke entertainment provider and over the past months ive slowly been expanding my business. The software I use is generally either PCDJ VJ or VIRTUAL DJ, in short both pieces of software allow me to play a karaoke cdg and view the lyrics on a seperate "extended" display. I currently do this through either an s-video or a hdmi cable.

I have now taken residency in a public house which has several plasma screens linked to a single point behind the bar. Now i would like to use these screens for my videos/karaoke/adverts but the only thing is im around 50ft away and im now allowed to install any long cables (because it would look untidy).

Im using a laptop which has a wireless b/g wifi card, ive also got hdmi-out, s-video out, vga-out, several usb-ports, and also the port for a network cable. Im sure i can transmit an extened desktop wirelessly but im not 100% sure how, and also do you have to first connect a second display directly to the laptop to activate the extended desktop system? Im will to spend a fair bit of money as the system will be a valuble assett. Oh and incase you require, my graphics card is an ATI Radeon X1200 which supports extended desktops.

Any help guys?
Thanks in advance.