function checkOrderForm() {
	 	var requiredFields = new Array;
	 	requiredFields[0] = "voorletters";
	 	requiredFields[1] = "achternaam";
	 	requiredFields[2] = "adres";
	 	requiredFields[3] = "huisnummer";
	 	requiredFields[4] = "postcode";
	 	requiredFields[5] = "plaats";
	 	requiredFields[6] = "land";
	 	requiredFields[7] = "emailadres";
	 	var errorMsg = "";
		for(var id in requiredFields) {
			var fieldName = requiredFields[id];
			if (document.forms.order[fieldName].value == "") {
			 	var firstChar = fieldName.substring(0,1).toUpperCase();
			 	fieldName = firstChar+fieldName.substring(1,fieldName.length);
				errorMsg += fieldName+"\n";
			}
		}
		if (errorMsg != "") {
		 	errorMsg = "De volgende velden zijn verplicht:\n\n"+errorMsg;
			alert(errorMsg);
			return false;
		} else {
		 	order.submit();
			return true;
		}		
	}
	
	function checkOrderForm2() {
	 	var errorMsg = "";
		if ((!document.getElementById('betaalmethode1').checked) && (!document.getElementById('betaalmethode2').checked)) {
			errorMsg += "Betaalmethode\n";
		}
		if (errorMsg != "") {
		 	errorMsg = "De volgende velden zijn verplicht:\n\n"+errorMsg;
			alert(errorMsg);
			return false;
		} else {
		 	order.submit();
			return true;
		}		
	}
	
	function popupImage(id,w,h) {
		window.open('fullsize.php?pid='+id+'&w='+w+'&h='+h,'','width='+(w+20)+',height='+h+',location=no,status=no,toolbar=no,resize=no');
	}
	function popupImage2(c,w,h) {
		window.open('fullsize2.php?c='+c+'&w='+w+'&h='+h,'','width='+(w+20)+',height='+h+',location=no,status=no,toolbar=no,resize=no');
	}	
	function popupImage_card(id,w,h) {
		window.open('fullsize_card.php?cid='+id+'&w='+w+'&h='+h,'','width='+(w+20)+',height='+h+',location=no,status=no,toolbar=no,resize=no');
	}
	function popupImage_card_inside(id,w,h) {
		window.open('inside_card.php?cid='+id+'&w='+w+'&h='+h,'','width='+(w+20)+',height='+h+',location=no,status=no,toolbar=no,resize=no');
	}