function addtocart(listboxid, prodID) {
	var http=getXMLHTTPRequest();
	if (document.getElementById('c'+listboxid)!=null) {
		if(document.getElementById('c'+listboxid).options[document.getElementById('c'+listboxid).selectedIndex].text=="UK size.."){
			alert("Please choose the size you would like to order");
			return;
		}
	}
	
	//send new product details via xmlHTTP then got the cart with window.location to avoid parameters in the URL
	if (document.getElementById('c'+listboxid)===null) {
		modurl = "http://www.apex-sports.co.uk/ajaxbasket.php?p="+prodID+"&a=add&s=n/a&display=N";}
	else {
		modurl = "http://www.apex-sports.co.uk/ajaxbasket.php?p="+prodID+"&a=add&display=N&s="+document.getElementById('c'+listboxid).options[document.getElementById('c'+listboxid).selectedIndex].text;
	}
	
	http.open("GET", modurl, true);
	http.onreadystatechange = function() {
		if (http.readyState == 4) {
			if(http.status == 200) {
				window.location="http://www.apex-sports.co.uk/shoppingcart.php";
			}
		}
	}
	http.send(null);
	
}