function popup(w,h,url)
{
        x = screen.availWidth/2-w/2;
        y = screen.availHeight/2-h/2;
        var popupWindow = window.open(
            url,'','width='+w+',height='+h+',left='+x+',top='+y+',screenX='+x+',screenY='+y+',scrollbars=yes');
}
function loadImg(imglarge)
{
	document.getElementById('image-large').src = imglarge;
}
function checkForm(formID)
{
	myForm = document.getElementById(formID);
	if (typeof(myForm) != "object") return false;
	myElements = myForm.elements;
	myError = new Array();
	for (f=0; f<myElements.length; f++){
		myElement = myElements[f];
		if (myElement.id.indexOf('_req') != -1){
			// REQUIRED FIELD
			if (myElement.value == "" || (myElement.type == "checkbox" && myElement.checked != true)) {
				myError.push(myElement);
			}
		}
	}
	if (myError.length > 0){
		alert("Bitte füllen Sie alle Pflichtfelder aus!");
		myError[0].focus();
		return false;
	} else { 
		return true;
	}
	return false;
}