Y doesnt this work

can anyone tell me y this form is not working for the guestlist…and this is t

he PHP script

<?php
$userEmail = $_POST[‘strEmail’];

$conn = mysql_connect(“localhost”, “nigolmvc_nigolmv”, “babystuff”);
mysql_select_db (“nigolmvc_nightspotz”, $conn);
$result = mysql_query(“INSERT into guestbook ( email) values (’$userEmail’)”);

?>