HELP Sql Update

[archonis]

i keep getting this error no matter what format I use in updating the database.

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''inbox' SET delete = '1' WHERE mailID = '218'' at line 1

the tabels i have are

Trevors4_MTD
inbox

lastonline

members

photos

Inbox culloms are

date text latin1_swedish_ci No

touser text latin1_swedish_ci No

fromuser text latin1_swedish_ci No

sub text latin1_swedish_ci No

msg text latin1_swedish_ci No

read text latin1_swedish_ci No

reply text latin1_swedish_ci No

delete text latin1_swedish_ci No

mailID int(1) No auto_increment

date2

ANY HELP?

<?
ini_set("session.cookie_domain"," .mytowndate.com");
session_start(); 

$myusername = $_SESSION['username']; 

$mailID1 = $_GET["mailID"];



$host="localhost"; // Host name 
$dbusername="**********"; // Mysql username 
$dbpassword="********"; // Mysql password 
$db_name="trevors4_MTD"; // Database name 
$tbl_name="inbox"; // Table name 

// Connect to server and select databse.
mysql_connect("$host", "$dbusername", "$dbpassword")or die("cannot connect"); 
mysql_select_db("$db_name")or die("cannot select DB");



$a = "1";	 
$sql = "UPDATE 'inbox' SET delete = '1' WHERE mailID = '$mailID1'; ";
mysql_query($sql) 
or die(mysql_error()); 


header( 'Location: http://****************') ;

?>

[halojoy]

I have changed some small things.
Read my comments in the script.

Most important I changed
'inbox' ....... -> inbox
in the SQL Query.
We never put 'quotes' on table name.
And never quotes on INT, number values ($mailID1)

<?php //always use <?php

ini_set("session.cookie_domain"," .mytowndate.com");
session_start();

$myusername = $_SESSION['username'];

$mailID1 = (int)$_GET["mailID"]; //mailID is INT field, not TEXT

$host="localhost"; // Host name
$dbusername="**********"; // Mysql username
$dbpassword="********"; // Mysql password
$db_name="trevors4_MTD"; // Database name
$tbl_name="inbox"; // Table name

// Connect to server and select databse.
// no need have quotes like "$host" etc, etc.
mysql_connect($host, $dbusername, $dbpassword)or die("cannot connect");
mysql_select_db($db_name)or die("cannot select DB");

$a = "1";    

//$sql = "UPDATE 'inbox' SET delete = '1' WHERE mailID = '$mailID1'; ";
//change to:
//$sql = "UPDATE inbox SET delete = '1' WHERE mailID = $mailID1"; 
$sql = "UPDATE inbox SET delete = '1' WHERE mailID = $mailID1";
mysql_query($sql)
or die(mysql_error());


header( 'Location: http://****************') ;

?>