Please help make this? [Unsolved] [closed]

http://www.roblox.com/Transponder-System-Please-help-item?id=152961184

Basically I need someone who knows very welly how to script to take the above set, and make it so that when the transponder (yellow brick) passes through the finish line (transparency brick) that the clock will start, then when the transponder touches the finish line again, the clock resets, and the time is displayed on the timer. (made from scoreboard pieces) I left the click up/click down buttons there for those who wish to see how the brick changes decals on each brick. Please if someone could help with this, that would be great. Willing to pay for someone's expertise!