Inserting a Running Clock Cell counting down

Hi

I have seen the code Leith has made here http://www.excelforum.com/excel-prog...lock-cell.html and it works perfectly.

I have done a little change to it in order to have a timer counting down the time. However I am unable to make the time stop when it reaches "00:00.0", How do I do that?

thanks

the code I am using is:

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thanks
Dedes