color buttons - repost

I need aprogram that is independent of other programs and will press a button onscreen when a color appears. The color streams in like a narrow ribbon, ( there two parallel ribbons of color) from the right side of the monitor and moves to the left (they can iniate anywhere from the top of the screen to the bottom of the screen) and press another button when the color switches. Total # of colors is 3. There can be one or two (permanent location , non moving) areas (one on top and one on bottom of viewing area?) to detect the presence and changing of color. The viewing area can resize itself. The speed that the color will appear and move can vary greatly so quick detection is important. Thanks to all in advance. Please include info as to what language and time necessary for the project. Full documentation is to be submitted with the completed project as this project will be expanded in the near future.