loadimg0 = new Image();
loadimg0.src = "/buchung/img/jag.jpg";
loadimg1 = new Image();
loadimg1.src = "/buchung/img/por356.jpg";
loadimg2 = new Image();
loadimg2.src = "/buchung/img/db230.jpg";
loadimg3 = new Image();
loadimg3.src = "/buchung/img/por911.jpg";
loadimg4 = new Image();
loadimg4.src = "/buchung/img/rr.jpg";
loadimg5 = new Image();
loadimg5.src = "/buchung/img/gtv.jpg";
loadimg6 = new Image();
loadimg6.src = "/buchung/img/tr4.jpg";
loadimg7 = new Image();
loadimg7.src = "/buchung/img/mga.jpg";

function ComputeTotal( form )
{
var CarType = 0;

 if(form.mon.checked) mon = 1;
  else mon = 0;
 if(form.tue.checked) tue = 1;
  else tue = 0;
 if(form.wed.checked) wed = 1;
  else wed = 0;
 if(form.thu.checked) thu = 1;
  else thu = 0;
 if(form.fri.checked) fri = 1;
  else fri = 0;
 if(form.sat.checked) sat = 3;
  else sat = 0;
 if(form.sun.checked) sun = 3;
  else sun = 0;
 if(form.weekend.checked) weekend = 3;
  else weekend = 0;
  
 if(form.sat.checked && form.sun.checked) { 
  spezial = 3;
  sat = 0;
  sun = 0;
 }
 else { spezial = 0; }

	Month = form.Month.value
	if(form.CarType.value == "jag") CarType = 7;
	if(form.CarType.value == "por356") CarType = 5;
	if(form.CarType.value == "db230") CarType = 6;
	if(form.CarType.value == "por911") CarType = 5;
	if(form.CarType.value == "rr") CarType = 7;
	if(form.CarType.value == "gtv") CarType = 3;
	if(form.CarType.value == "tr4") CarType = 4;
	if(form.CarType.value == "mga") CarType = 4;

	WeekDay = mon + tue + wed + thu + fri + sat + sun + spezial
	if(form.weekend.checked) {
	WeekDay = weekend;
	form.mon.checked = false;
	form.tue.checked = false;
	form.wed.checked = false;
	form.thu.checked = false;
	form.fri.checked = false;
	form.sat.checked = false;
	form.sun.checked = false;
	}
 total =  (CarType * Month) * WeekDay
 form.total.value = total
}

function ChangeCar() {
  imagedir = "img/";
		extension =".jpg";
  current = document.calculator.CarType.selectedIndex;
  document.images.samplecar.src = imagedir + document.calculator.CarType[current].value + extension;
}