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 check(form) {
	var required = form.REQUIRED.value.split(",");
	for (i = 0;i < required.length; i++) {
		// check if the current field is an option field (radio, checkbox)
		var optionField = true;
		if (form.elements[required[i]].length == null || form.elements[required[i]].length == undefined) {
			optionField = false;
		}
		
		// _label field is not defined, so show fieldname
		if (form.elements[required[i]+'_label'] == null || form.elements[required[i]+'_label'] == undefined) {
			var whichField = required[i];
		} 
		// _label field is defined, show value of corresponding _label field
		else {
			var whichField = form.elements[required[i]+'_label'].value;
		}
		
		// check option field
		if (optionField) {
			// iterate all options and check if minimum one field is checked
			var selectedOptions = false;
			for (var j = 0;j < form.elements[required[i]].length;j++) {
				selectedOptions |= form.elements[required[i]][j].checked;
			}
			if (selectedOptions == 0) {
				alert("Es ist eine Angabe im Feld >"+whichField+"< notwendig!");
				form.elements[required[i]][0].focus();
				return false;
			}
		} 
		// check non-option field
		else {
			if (form.elements[required[i]].value == '') {
				alert("Es ist eine Angabe im Feld >"+whichField+"< notwendig!");
				form.elements[required[i]].focus();
				return false;
			}
		}
	}
	return true;
}