function validateForm() {
    form = document.myform;
    message = "";
    message += form.first_name.value ? "" : "First Name\n";
    message += form.last_name.value ? "" : "Last Name\n";
    message += form.address1.value ? "" : "Address\n";
    message += form.city.value ? "" : "City\n";
    message += form.state.value ? "" : "State\n";
    message += form.zip.value ? "" : "Zip\n";
    message += form.phone.value ? "" : "Phone Number\n";
    message += form.email.value ? "" : "E-mail\n";
    
    if(message) {
        message = "Please provide the following information\n" + message;
        alert(message);
        return false;
    }
    return true;
}