insert i database

Kode 

<h1>Skriv Nyheder</h1><br />

Overskrift:<br />
<form action="" method="post">
<input type="text" name="overskrift" style="width:300px; color: #666666; font-size: 8pt; border: 1px solid #C0C0C0; padding: 2px; background-color:#FFFFFF" /><br />
Nyhed:<br />
<textarea name="nyhed" style="height:200px; width:300px; margin-top:2px; color: #666666; font-size: 8pt; border: 1px solid #C0C0C0; padding: 2px; background-color:#FFFFFF"></textarea>
<br />

<input type="submit" name="submit" value="Skriv nyhed" style="margin-top:2px; color: #666666; font-family: Verdana; font-size: 8pt; border: 1px solid #C0C0C0; padding: 2px; background-color:#FFFFFF" />
</form>
<?php



if(isset($_POST['submit'])) {

$overskrift = $_POST['overskrift'];
$nyhed = $_POST['nyhed'];
$dato    = date('d/m-Y');
$klok    = date('H:i');

include("../config.php");

mysql_query("INSERT INTO nyhed ($overskrift, $nyhed, $dato, $klok) VALUES ('', '$overskrift', '$nyhed', '$dato', '$klok',");

echo "Nyheden blev tilføjet";
}
?>