A little help would be greatly appreciated

[TheM1ghtyTh0r]

I'm relatively new to programming and the hole PSP scene and I need a little help with my lua program. What I'm looking to do is make a stopwatch type thing in my program using 10 images. ( 0 - 9 and : ) and I've been trying to do it myself for the past 2 days and have made ZERO progress. I would like it to start when I press CROSS, stop when I press CIRCLE, and go back to 00:00:00 when I press SQUARE. If someone could help me out a little It would mean allot to me. thx