That is a mini-VGA output, so you need a mini-VGA to something cable. The "something" depends upon exactly what connectors you have on the TV. If it has a VGA socket (many do) then something like http://www.dealextreme.com/p/mini-vga-to-vga-cable-white-10104
should do the job (but note that this is video ony, not audio). TBH, if I were you I would go to a computer shop (ideally an Apple Store) and ask them what you need. Tell them the exact model number of your Mac and take the manual for your TV so that they can see what inputs it has.