Timer Problems

Hi guys,

I hope you can help me, i have set up a timer, which was the easy bit. Is it possible for me to know everytime 5 seconds have elapsed on the timer.

For example if i have a timer that runs for 20 secs, how can I know when the timer is at 15 then at 10 then at 5 etc.

Any help would be much appreciated.

:hair: