void delay_ms( uns16 millisec)	//Delays multiples of 1 milliseconds at 4 MHz
								//Accepts a 16 bit parameter for required delay
{
    char next = 0;				//Defines the 8 bit character 'next' and sets it to 0
    
    OPTION = 0b.0010; 			//0 Assigns the prescaler to TMR0
    							//010 Sets the prescaler to 8
    							//This lengthens the clock pulse by 8 for every PIC instruction cycle
    								
    TMR0 = 2;  					//The timer increments TMR0 with every clock pulse except the first 2
    							//Starting the counter from 2 overcomes this error
    
//Do the following at least once and until last 'while' statement is no longer true							
    do
    {
        next += 125;				//Each loop increments 'next' by 125
        							//This creates a larger value to compare against the TMR0 timer
        							
        while (TMR0 != next);  		//Wait until the TMR0 counter equals 'next'
        							//This condition is true every 1000uS (1ms) because:
        							//Most instructions take 4 clock cycles
        							//4MHz / 4 = 1 million instructions per second (1uS each)
        							//1uS * 8 prescaler * 125 = 1000uS (1ms) per loop
        							
     }
    	while ( -- millisec != 0);	//Final part of the 'do' statement
    								//Reduce the 'millisec' parameter by 1 for each loop
    								//ie: count down by 1ms per loop until 0
}