function check_required(f) {
req_message = "The following fields are required:\n\n";
req_return = true;
if (f.name_field1.value == '') {
        req_message += "Your Name\n";
        req_return = false;
}
if (f.address_field1.value == '') {
        req_message += "Address\n";
        req_return = false;
}
if (f.city_field1.value == '') {
        req_message += "City\n";
        req_return = false;
}
if (f.state_field1.value == '') {
        req_message += "State\n";
        req_return = false;
}
if (f.zip_field1.value == '') {
        req_message += "Zip Code\n";
        req_return = false;
}
if (f.email_field1.value == '') {
        req_message += "Email Address\n";
        req_return = false;
}
if (req_return == false) {
                 alert(req_message)
        }
return(req_return);
}