ajax form

Hi,

I’m trying to send an email true a ajax contact form, but something seems to be wrong. I see the ajax load the right file (mail.php) but still it doesn’t send the email.

I have 4 different files for this action:
– form
– default.js
– mail.php
– functions.php

form:

<form id="contact_form" action="" method="POST">
            <input id="name" type="text" name="name">
            <input id="email" type="email" name="email">
             <select id="location" name="location">
            	<?php
				$args = array('post_type' => 'locatie');
				$loop = new WP_Query( $args ); 

                 while ( $loop->have_posts() ) : $loop->the_post();

             		 echo '<option value="'.get_the_title().'">'.get_the_title().'</option>';

                 endwhile;
				 ?>
            </select>
             <select id="type" name="type">
              <option value="huren">Huren</option>
              <option value="adverteren">Adverteren</option>
            </select>
            <textarea id="message" name="message">Opmerkingen en/of vragen</textarea>

            <input id="submit" type="submit" value="Verzenden">
</form>

default.js

jQuery('#contact_form').submit(ajaxSubmit);

	function ajaxSubmit(){
		jQuery.ajax({
			type:"POST",
			cache: false,
			url: "/wp-content/themes/test/mail.php",
			data: $('#contact_form').serialize(),
			dataType: "html",
			success:function(data){
				alert(data);
			}
		});
		return false;
	}

mail.php
<?php contact_send_message(); ?>

functions.php

function contact_send_message() {
    $contact_errors = false;

    $name = $_POST["name"];
    $email = $_POST["email"];
    $message = $_POST["message"];
    $type = $_POST["type"];
    $location = $_POST["location"];

    $header .= "From: ". $name ." <".$email.">";

    $message .= "Naam: $vname" . "\r\n";
    $message .= "E-mail: $email" . "\r\n";
    $message .= "Type: $type" . "\r\n";
    $message .= "Locatie: $location" . "\r\n";
    $message .= "Vraag en/of opmerking: $message";

    $subject = "e-mail via test.be";
    $subject = "=?utf-8?B?" . base64_encode($subject) . "?=";

    $to = "[email protected]";

	wp_mail($to, $subject, $message, $header);

    if( !wp_mail($to, $subject, $message, $header) ) {
        $contact_errors = true;
    }
}
add_action('contact_send_message', 'contact_send_message');

Any idea what’s wrong?
Thanks