I am using excel 2003 to keep lap times in a dirt bike race. I have a command
button that is clicked to record the time the race starts. The code is below.

Private Sub StartButton_Click()
Worksheets("Timing Sheet").Range("A6").Value = Format(Now, "h:mm:ss")
End Sub

What I need to do is to ensure that the button is not clicked accidently
after the race has started. Is there a way that I can count how many times it
has been clicked and if it is more than once it comes up with a warning along
the lines of "the race has started are you sure you want to change the race
start time" with a yes/no option.

The other thing I would like to do is store a backup copy of the original
start time somewhere else in the worksheet in a way that it is nopt updated
every time the button is clicked.

Any help will be gladly appreciated.

Thank you