Creating a contact form that sends to a specific email address

I’m working in AS 2.0, Flash CS3. I want to make a contact form that allows a user to select the appropriate e-mail address from a combo box. I have made a working contact form that send to one e-mail address using PHP.

Here is the AS for it:

var sendLoad = new LoadVars ();
 var receiveLoad = new LoadVars ();
 send_btn.onRelease=function () {
 sendLoad.name_input=name_input.text;
 sendLoad.email_input=email_input.text;
 sendLoad.message_input=message_input.text;
 sendLoad.subject_input=subject_input.text;
 if(name_input.text=="") {
 name_dynamic.text = "*Name*";
 } else if (email_input.text==""){
 email_dynamic.text="*Email*";
 subject_dynamic.text="*Subject*";
 } else if(message_input.text==""){
 message_dynamic.text="*Message*";
 }else {
 sendLoad.sendAndLoad("mail2.php", receiveLoad);
 gotoAndStop (2)
 }
 }

and here is the PHP code:

<?php
$userEmail = $_POST[‘email_input’];
$to = $userEmail . “, my_email@my_domain.com”;
$subject = $_POST[‘subject_input’];
$message = "Name: ".$_POST[‘name_input’];
$message .= "
".$_POST[‘message_input’];
mail ($to, $subject,$message);
?>

Now… how do I make a Combobox that allows the user to select who to send their e-mail to? (all I want are 3 address)

Thanks a lot!