Reduce display image on a LCD screen!!!

I need to reduce the display size on a LCD screen. The project I'm working on requires this display reduction... Has anyone tried doing this??? I used a Dell 19" CRT and I'm able to reduce the image on the screen creating a 1/2" to and 1" border around the display image. When I connect to a LCD the controls from the video card are disabled... I would appreciate any thoughts or ideas. Is there a 3 party program that would help me?? Thanks, in advance... Tony