function addToCart(sku) {
	var form = document.getElementById('add_product');

	// Validate entered quantity
	var quantity = form.quantity.value;
        var newquantity = quantity.replace(/^\s*|\s*$/,"");
        //alert ("Quantity ="+ quantity);

	if (isNaN(newquantity) || (newquantity == '') || (newquantity == 0) || (newquantity == null) ) 
        {
		alert("Please enter a number.");
		form.quantity.focus();
		return;
	}
        // call AddVSItemToCart()
	//MXfer.AddVSItemToCart(sku);
	//form.submit();
}