unsigned int count;

SIGNAL (SIG_OVERFLOW0) 
	{
	TCNT0+=130;
	count++;
	return;
	}	 

void timer_init (void) 
	{ 
		TIMSK = _BV(TOIE0);              //Timer Overflow Interrupt enable 
		TCNT0 = 130;                     //Rücksetzen des Timers 
		TCCR0 = _BV(CS01);               //Prescaler 8 
		sei (); 
	}

void delay_ms(unsigned int ms){
	count=0;
	TCNT0 = 130;
	while(count<=ms)
		{
		sleep_mode();
		}
	return;
}