function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function chkNbr(Obj) {
	var wert = document.getElementById(Obj).value;
	if(wert.match(/,/)) {
		document.getElementById(Obj).value = wert.replace(/,/,".");
	}
}

function calcMwSt(typeOf,value) {
	
	if(document.getElementById('mwst19').checked == true) {
		var mwstSatzMul = 0.19;
		var mwstSatzDiv = 1.19;
	} else if(document.getElementById('mwst7').checked == true) {
		var mwstSatzMul = 0.07;
		var mwstSatzDiv = 1.07;
	} else {
		alert('Bitte wählen Sie Ihren gewünschten Mehrwertsteuersatz!');
		return false;
	}
	
	var givenValue = value;
	
	if(givenValue != '' && givenValue > 0) {
		var singleWert  = document.getElementById(typeOf+'Value');
		var togetherWert = document.getElementById(typeOf+'MwSt');
		var doubleWert  = document.getElementById(typeOf+'All');
		
		if(typeOf == 'brutto') {
			
			var percentValue 			= runden(givenValue/mwstSatzDiv,2);
			
				singleWert.innerHTML 	= runden(givenValue,2);
				togetherWert.innerHTML 	= runden(givenValue-percentValue,2);
				doubleWert.innerHTML 	= percentValue;
			
		} else if(typeOf == 'netto') {
			
			var percentValue 			= runden(givenValue*mwstSatzMul,2);
			
				singleWert.innerHTML 	= runden(givenValue,2);
				togetherWert.innerHTML 	= runden(percentValue,2);				
				doubleWert.innerHTML 	= runden(parseFloat(givenValue)+parseFloat(percentValue),2);
			
		} else {
			alert('Fehler!\nVorgang wird abgebrochen!');
		}
	}
}

function runden(x, n) {
  if (n < 1 || n > 14) return false;
  var e = Math.pow(10, n);
  var k = (Math.round(x * e) / e).toString();
  if (k.indexOf('.') == -1) k += '.';
  k += e.toString().substring(1);
  return k.substring(0, k.indexOf('.') + n+1);
}