Box slider after 1 min - php

Question

working when you click "send" email to come forward with a box which read "thanks for the information." and after the box slideup again after 1min.
when I click on "send" and then it just down but the slider is not up in some manner whatsoever.
<div class="kontakt_box">
<h3>Kontakt Mads Ørnfeldt Andersen</h3>
<p>Kom i kontakt med Mads Ørnfeldt Andersen</p>
<form action="#" method="post" name="kontakt_box">
<label>Navn<br /><input type="text" name="navn" required title="Angive et Navn" class="new" placeholder="Navn"></label><br />
<label>Efternavn<br /><input type="text" required title="Angive et efternavn" name="efternavn" class="new" placeholder="Efternavn"></label><br />
<label>Email<br /><input type="email" required title="Angive en email!" name="email" class="new" placeholder="Email"></label><br />
<label>Tekst<br /><textarea name="tekst" cols="35" rows="10" class="new" placeholder="Tekst til email"></textarea></label><br />
<label><input type="submit" name="send" value="Send" class="new send_email"></label>
</form>
<?php
if(isset($_POST["send"]))
{
$email_afsender = $mebe->email_afsender();
}
if($_SESSION["email_sendt"] == true)
{
echo "<div class=\"tak_email\">Tak</div>";
}
?>
</div>
<script>
$('.send_email').click(function() {
$('.tak_email').slideUp('slow', function() {
// Animation complete.
});
});
</script>
here are im my function:
function email_afsender()
{
$_SESSION["email_sendt"] = true;
$fra = $_POST["navn"] . " " . $_POST["efternavn"] . "<" . $_POST["email"] . ">";
$til = "jp#absb.dk";
$emne = "Kontakt blabla.dk - " . $_POST["navn"] . " " . $_POST["efternavn"];
$besked = $_POST["tekst"];
//headers
$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/html; charset=UTF-8\r\n";
$headers .= "From: " . $fra . "\r\n";
mail($til, $emne, $besked, $headers);
$TargetPage = "/kontakt/";
header('Location: ' . $TargetPage);
}

Answer 1

Your code is not valid. You did not specify the action file in your form and you are going to submit it??