Ron,
There are several variables that will change the way that you accomplish your goal, but it is very doable. The location that you are going to place the flat screen TV will change the way that it is wired. Also the goal that you have in going to the flat screen TV will influence the way that the project is handled.
Other influencing factors will be the picture definition that you want to achieve on the new TV, and what kind of wiring input the TV is equipped with. If you can answer these questions we will be able to help you, or you can call me personally and we can discuss the project over the phone.
Gerald Farris
713-254-4156