Very Simple PHP MySQL Update Problem

I don't understand, I'm trying to edit a field in the db. From the form to the db update page I'm echoing out what I want to edit in the db so I'm guessing it's the WHERE clause that's making it not update. Anyway here's the code:

<?php
$id=$_POST['id'];
$image=$_POST['image']; 
mysql_query("UPDATE 'slider' SET 
image = '$image'
WHERE 'id' = '$id' ");
echo "<font color=green>Success:</font> The slider image was updated in the database!<br><br><font color=red><b>YOU WILL BE REDIRECTED SHORTLY...</font></b><meta http-equiv='REFRESH' content='3;url=slider.php'>";
?> 
<br>
<?php echo"$id";?><br>
<?php echo"$image";?>

PHP:

As I say, it's echoing out fine.

Anyone know how to fix this?

 

I assume you are connected to the DB beforehand.

The syntax is incorrect, should be:

mysql_query("UPDATE `slider` SET
`image` = '$image'
WHERE `id` = '$id' ");

PHP:

 

Oh you sexy so-and-so thanks!