function updateAddLink(obj) {
		    var qty = obj.value;
		    if (qty == NaN) {
		        qty = 1;
		    }
		    else if (qty < 1) {
		        qty = 1;
		    }
		    obj.nextSibling.href = obj.nextSibling.href.replace(/qty=\d+/, "qty=" + qty);
		};