You can create a clock in actions...just search the general Opus help for 'Clock Actions'
You can then use buttons to trigger the clock... start, stop, pause
You can also create a script clock. Create it when the first page loads, then attach the start/stop to buttons.
Code:
myClock = CreateClock("ScriptClock","clock_var","[hh],[mm],[ss],[ff]")
myClock.Start()
myClock.Stop()
With the script clock, you then have to extract the minutes/seconds from the clock_var, so the actions may be an easier route??
If you need more specific help on the actions, post again and myself or someone else will help.
Sandy