function ValidateForm(formName) {
    var Firstname = document[formName].Firstname;
    var Lastname = document[formName].Lastname;
    var Address = document[formName].Address;
    var ContactNumber = document[formName].ContactNumber;
    
    var AppointmentType = document[formName].AppointmentType;
    var AppointmentDay = document[formName].AppointmentDay;
    var AppointmentMonth = document[formName].AppointmentMonth;
    var AppointmentTime = document[formName].AppointmentTime;
    
 
    var invalidMsg = "Please enter your first name.";
    if (Firstname.value == null || Firstname.value.replace(/\s/g,"") == "") {
        alert(invalidMsg);
        Firstname.focus();
        return false;
    }
    var invalidMsg = "Please enter your Last name.";
    if (Lastname.value == null || Lastname.value.replace(/\s/g,"") == "") {
        alert(invalidMsg);
        Lastname.focus();
        return false;
    }
    var invalidMsg = "Please enter your address.";
    if (Address.value == null || Address.value.replace(/\s/g,"") == "") {
        alert(invalidMsg);
        Address.focus();
        return false;
    }
    var invalidMsg = "Please enter your contact number.";
    if (ContactNumber.value == null || ContactNumber.value.replace(/\s/g,"") == "") {
        alert(invalidMsg);
        ContactNumber.focus();
        return false;
    }
    var invalidMsg = "Select your appointment type.";
    if (AppointmentType.value == null || AppointmentType.value.replace(/\s/g,"") == "") {
        alert(invalidMsg);
        AppointmentType.focus();
        return false;
    }
    var invalidMsg = "Select which Day you'd like the appointment.";
    if (AppointmentDay.value == null || AppointmentDay.value.replace(/\s/g,"") == "") {
        alert(invalidMsg);
        AppointmentDay.focus();
        return false;
    }
    var invalidMsg = "Select which Month you'd like the appointment.";
    if (AppointmentMonth.value == null || AppointmentMonth.value.replace(/\s/g,"") == "") {
        alert(invalidMsg);
        AppointmentMonth.focus();
        return false;
    }
    var invalidMsg = "Select what Time you'd like the appointment.";
    if (AppointmentTime.value == null || AppointmentTime.value.replace(/\s/g,"") == "") {
        alert(invalidMsg);
        AppointmentTime.focus();
        return false;
    }
    
    return true;
}