void Strobe_Lights(void)
{
	static clock=0,		// The functio's clock own clock "memory" so
		first_time=1;	// the function can initialize on its
				// first call

	// Test whether this is the first time
	
	if (first_time)
	{
		first_time=0;	// Reset first-time flag.
		// Do initializations.
	} // end if first time
	
	else // not first time i.e. nth time
	{
		// Test whether it's time to do action
		if (++clock==100)
		{
			change color register
			// Reset the clock
			clock=0;
		} // end if time to do action
	} // end else
} end Strobe_Lights