Playing DVD's on a TV

Hi. I have a Flat Screen TV. Here is what I want to do. I want to be able to play DVD's with audio, as well as be able to view my computer screen on both the TV and the computers monitor. I have 2 monitors connected to the video card - one analog and one digital. I want to switch the digital from the PC monitor to the TV and vice versa when needed. Do I need some sort of video switch? Will I also need to have audio cables ran from the PC to the TV? And if so - will I need a special sound card? All I have at the moment is on-board standard stereo sound.