function startCalc(){
  interval = setInterval("calc()",1);
}

function calc(){


	if (document.calc_form.c1.checked) {
		fokusgrupp = document.calc_form.one.value * 2500;
	} else {
		fokusgrupp = 0;
	}
	
	if (document.calc_form.c8.checked) {
		workshop = document.calc_form.eight.value * 3500;
	} else {
		workshop = 0;
	}
	
	if (document.calc_form.c9.checked) {
		openspace = document.calc_form.nine.value * 3500;
	} else {
		openspace = 0;
	}


	if (document.calc_form.c2.checked) {
		kvantitet = document.calc_form.two.value * document.calc_form.three.value;
	} else {
		kvantitet = 0;
	}


		light = 0;

	if (document.calc_form.c4.checked) {
		komplett = 7000;
		document.calc_form.c6.disabled=false;
	} else {
		komplett = 0;
		document.calc_form.c6.disabled=true;

		document.calc_form.c6.checked=false;
		HideDisplay('show_3');

	}

		pdf = 0;

	if (document.calc_form.c6.checked) {
		tryck = 3 * document.calc_form.four.value + 11000 + komplett;
	} else {
		
		tryck = 0;
	}

		presentation = 0;
	


  	total = fokusgrupp + kvantitet + light + komplett + pdf + tryck + presentation + openspace + workshop;

	document.calc_form.total.value = total + ' kr';
}

function stopCalc(){
  clearInterval(interval);
}