function addtotal(objRef) {
    if (objRef.subtotal.value !="") {
    var subtotal = objRef.subtotal.value -0;
    var shipping = (subtotal)*.05; 
    var salestax = (subtotal)*.06; 

    result = subtotal + shipping + salestax;
	//alert(result);

    shipping = shipping.toFixed(2);
	objRef.shipping.value = shipping; 

    salestax = salestax.toFixed(2);
	objRef.salestax.value = salestax; 

    objRef.total.value = result.toFixed(2);
    } 
}