Não está enviados os dados para a base de dados

Oi pessoal, ando a tentar inserir informação para a base de dados, mas não me está a enviar, deixo aqui o codigo abaixo, talvez me possam ajudar.

Pagina adicionar "job"

<?php require_once("../includes/connection.php");

$query = "SELECT * FROM jobs";

$result = mysql_query($query);

while($job = mysql_fetch_array($result)){

	echo "<h3>" . $job['title_job_en'] . "</h3>";
	echo "<p>" . $job['job_description_en'] . "</p>";

}
?>

<h1>Create a Job</h1>
<form action="create_job.php" method="post">
Title En: <input type="text" name="title_job_en" value="" /><br />
 Title PT: <input type="text" name="title_job_pt" value="" /><br />
 Location: <input type="text" name="location" value="" /><br />
 Job Description PT: <input type="text" name="job_description_pt" value="" /><br />
 Job Descript EN <input type="text" name="job_description_en" value="" /><br />

<input type="submit" name"submit" />

</form>

create_job.php

<?php require_once("../includes/connection.php");

$title_job_en = $_POST['title_job_en'];
$title_job_pt = $_POST['title_job_pt'];
$location = $_POST['location'];
$job_description_en = $_POST['job_description_en'];
$job_description_pt = $_POST['job_description_pt'];

if(!$_POST['submit']){
	echo "please fill out the form";

	header('Location: add_job.php');

}else{

	mysql_query ("INSERT INTO jobs ('id_job','title_job_en','title_job_pt','location','job_description_en','job_description_pt')
 VALUES(NULL,'$title_job_en','$title_job_pt','$location','$job_description_en','. $job_description_pt')") or die(mysql_error());
	echo "Jobs has beend added!";
	header('Location: home.php');

}

?>

Base dados:

tabela: jobs

• id_job
• title_job_en
• title_job_pt
• location
• job_description_en
• job_description_pt

Abraço