var xmlObj;

function loadXMLDoc(u, id) {
	// branch for native XMLHttpRequest object
    if (window.XMLHttpRequest) {
        xmlObj = new XMLHttpRequest();
        xmlObj.onreadystatechange = function(){processReqChange(id)};
        xmlObj.open("GET", u, true);
        xmlObj.send(null);
    // branch for IE/Windows ActiveX version
    } else if (window.ActiveXObject) {
        xmlObj = new ActiveXObject("Microsoft.XMLHTTP");
        if (xmlObj) {
            xmlObj.onreadystatechange = function(){processReqChange(id)};
            xmlObj.open("GET", u, true);
            xmlObj.send();
        }
    }
}

function processReqChange(id) {
    if (xmlObj.readyState == 4) {   //State  : Loaded
		if (xmlObj.status == 200) { //Status : OK
			document.getElementById(id).innerHTML = xmlObj.responseText;
        } else {
            alert('There was a problem retrieving the XML data:\n' + xmlObj.statusText);
        }
    } else {
		document.getElementById(id).innerHTML = 'Loading...';
	}
}

function loadHTML(u, o){
	if (xmlObj) {
		if(xmlObj.readyState != 4){
			setTimeout('loadHTML(\''+u+'\', \''+o+'\')', 100);
		} else {
			loadXMLDoc(u, o);
		}
	} else {
		loadXMLDoc(u, o);
	}
}

function product(id, type){
	document.location = 'default.asp?id=15&product='+id+'&type='+type;
}

function goPage(id){
	document.location = 'default.asp?id='+id;
}

function download(id){
	document.location='/download.asp?id='+id;
}

function openImage(id){
	var leftPos = (screen.availWidth-100) / 2;
	var topPos = (screen.availHeight-100) / 2;
	window.open('/image-preview.asp?id='+id,'', 'scrollbars=no,resizable=yes,status=no,toolbar=no,width=100,height=100,top=' + topPos + ',left=' + leftPos);
}

function toggleCart(d){
	document.getElementById('cart').style.display = d;
}

function goCart(){
	document.location = '/cart.asp?u='+escape(document.location);
}

function addToCart(pid){
	var aantal = document.getElementById('aantal').value
	document.location = '/cart.asp?action=add&pid='+pid+'&aantal='+aantal+'&u='+escape(document.location);
}

function emptyCart(){
	if (confirm('Weet u zeker dat u uw winkelwagen wilt legen?')) {
		document.location = '/cart.asp?action=empty&u='+escape(document.location);
	}
}

function login(){
	document.location = '/account.asp?action=login';
}

function removeFromCart(pid){
	if (confirm('Weet u zeker dat u dit artikel uit de winkelwagen wilt verwijderen?')){
		window.location = 'cart.asp?action=remove&pid='+pid+'&u='+escape(document.getElementById('u').value);
	}
}

function changeNumber(c, id, pid){
	min = 1;
	var aantal = document.getElementById(id);
	if (isNaN(parseFloat(aantal.value))) {
		alert('Aantal moet een numerieke waarde zijn.');
	} else {
		newValue = parseFloat(aantal.value) + c;
		if (newValue < min) {
			if (confirm('Weet u zeker dat u dit artikel uit de winkelwagen wilt verwijderen?')){
				window.location = 'cart.asp?action=remove&pid='+pid+'&u='+escape(document.getElementById('u').value);
			} else {
			 	aantal.value = min;
				modified = true;
			}
		} else if (newValue > 0) {
			aantal.value = newValue;
			modified = true;		
		}
	}
}

function recalcCart(){
	document.cart.order.value = 'false';
	document.cart.submit();
}

function orderCart(){
	if (modified) {
		document.cart.order.value = 'true';
		document.cart.submit();
	} else {
		document.location = 'order.asp';
	}
}

function showImage(img){
	var leftPos = (screen.availWidth-100) / 2;
	var topPos = (screen.availHeight-100) / 2;
	window.open('/image-preview.asp?img='+escape(img),'', 'scrollbars=no,resizable=yes,status=no,toolbar=no,width=100,height=100,top=' + topPos + ',left=' + leftPos);
}