function PurchaseItem()
{
	var url=document.getElementById("purchasefrm").action + "?ProductID=" + document.getElementById("id").value;

	if (document.getElementById("singlesize"))
	{ url=url + "&Size=" + document.getElementById("singlesize").value; }

	if (document.getElementById("size"))
	{
		if (document.getElementById("size").options[document.getElementById("size").selectedIndex].value == "")
		{
			alert("Please select the desired size of the photo.");
			return;
		}

		else
		{ url=url + "&Size=" + document.getElementById("size").value; }
	}

	window.location.href=url;
}

if (typeof document.getElementById("purchasebtn").addEventListener != "undefined")
{ document.getElementById("purchasebtn").addEventListener("click",PurchaseItem,false); }

if (typeof document.getElementById("purchasebtn").attachEvent != "undefined")
{ document.getElementById("purchasebtn").attachEvent("onclick",PurchaseItem); }