OKay I was making a DJ Application form but it says that I haven't filled in all fields

THE FORM:
HTML Code:
<?php
$ipi = getenv("REMOTE_ADDR");
?>

<form method="post" action="sendmail.php">

<p><font face="Verdana" size="1">Habbo Name<br>
    <input type="text" name="name" size="30"></font></p>

    <p><font face="Verdana" size="1">Email Address<br>
    <input type="text" name="email" size="30"></font></p>

    <p><font face="Verdana" size="1">Hotel Used<br>
    <select size="1" name="hotel">
    <option selected>Choose one...</option>
    <option>UK</option>
    <option>USA</option>
    <option>CA</option>
    <option>AU</option>
    <option>Other</option>
    </select></font></p>

    <p><font face="Verdana" size="1">Time Zone<br>
    <input type="text" name="timezone" size="10"></font></p>

    <p><font face="Verdana"></font><font face="Verdana" size="1">DJ'ing Equipment<br>
    <select size="1" name="equipment">
    <option selected>Choose one...</option>
    <option>Winamp/Shoutcast</option>
    <option>Sam Broadcaster</option>
    </select></font></p>

    <p><font face="Verdana" size="1">Do you have a working microphone<br>
    <select size="1" name="microphone">
    <option selected>Choose one...</option>
    <option>Yes</option>
    <option>No</option>
    </select></font></p>

    <p><font face="Verdana" size="1">Do you have a working microphone<br>
    <select size="1" name="songs">
    <option selected>Choose one...</option>
    <option>Yes</option>
    <option>No</option>
    </select></font></p>

    <p><font face="Verdana" size="1">Past Experience (put NONE if you have had 
    no experience)<br>
    <textarea rows="5" name="experience" cols="29"></textarea></font></p>

<input type="submit" value="Send" />
</form>
SEND:
PHP Code:
<?php
if(!$visitormail == "" && (!strstr($visitormail,"@") || !strstr($visitormail,"."))) 
{
die ("Invalid Email Address"); 
$badinput = "<h2>Feedback was NOT submitted</h2>\n";
echo $badinput;
}
if(empty($visitor) || empty($visitormail) || empty($notes )) {
die ("You didn't fill in all the fields");
}

$subject = $hotel; 

$message = "Name: $name \n
Email: $email \n
Hotel: $hotel \n
Time Zone: $timezone \n
Equipment: $equipment \n
Microphone: $microphone \n
Songs: $song \n
Experience: $experience \n
Additional Info : IP = $ip \n
";

$from = "From: $email\r\n";


mail("[email protected]", $name, $email, $hotel, $timezone, $equipment, $microphone, $experience);

?>