Uhmmm you need to buy a video/monitor splitter with the right type of ports (VGA, HDMI, RGB, Component, S-Video, etc.) to suit your TVs. Buy a splitteror multi-splitters with as many outputs as your TVs.
ftt:
I dont know why you would like to do that, is it for a fashion show or something? Or a commercial display? Its just not nice to see those black bars in between the pics obstructing the picture. But if you insists on doing that instead of a projector then yeah you need a video splitter that can accomodate the number of plasmas you intend to put up. Then feed them to a computer where the software (OS or third party) will configure it for you any way you please it to be shown..