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timing functions

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Im working on a servo control programm in c for an avr microcontroller. Now my problem is the timing(I need 0.5-1.5ms of the bit set). Here are my 'wait' functions. I use twait to wait 0.5ms for example. Whats wrong with them? I want to be sure these work before I look everywhere why the servo isnt running.
#define CLOCK_KHZ 8000 //8 MHz chip

void cwait(unsigned int cycles)
{        
	int i;
	for(i = 0; i < cycles; ++i)
	{
		;
	}
}

void twait(float milliseconds)
{
	cwait(CLOCK_KHZ*milliseconds);
}

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