Position vs. Time

This experiment uses the computer and the multimedia system to display graphs of Distance vs Time, Velocity vs Time and Acceleration vs Time.
[img]http://www.phys.ufl.edu/demo/1_Mechanics/D_MotionTwoDimensions/PersonMotionsensor.jpg[/img]
http://www.phys.ufl.edu/demo/1_Mechanics/D_MotionTwoDimensions/PersonMotionsensor.html


i can figure out the rest except the click to drag part with a running time. may be i need some example to follow the syntax ;D