function CheckOrder () { 
    var errorMsg = "";
    var quantity = 0;
    var nanQuantity = 0;
    
    if (document.order_info.firstname.value == "") {
        errorMsg += "\nPlease enter your first name.\n";    
    }

    if (document.order_info.lastname.value == "") {
        errorMsg += "\nPlease enter your last name.\n"; 
    }

    if (document.order_info.email.value == "") {
        errorMsg += "\nPlease enter your email address.\n";   
    }

    if (errorMsg != "") {
        errorMsg += alert(errorMsg + "\n\n");
        return false;
    }

    return true;
}