SQL Syntax Error

<?php

include 'config.php';  

$sql = " INSERT INTO computer ";  
$sql .= " SET ";  
$sql .= " name			='". $_POST['name'] ."', ";  
$sql .= " ip			='". $_POST['ip'] ."', ";  

$db_erg = mysql_query( $sql );
if ( ! $db_erg )
{
  die('Ungültige Abfrage: ' . mysql_error());  
}

?>

<form action="newid.php" Method="post" enctype="text/html">  
<table align=center >
<tr>
 <th colspan=2 >Daten des Rechners:</th>
</tr>
<tr>
 <td>Name:</td>
 <td><input type="text" name="name" size="40" maxlength="40" ></td>  
</tr>
<tr>
 <td>IP:</td>
 <td><input type="text" name="ip" size="40" maxlength="40" ></td>  
</tr>
<tr>
<td><input type="submit" value="Absenden"></td>  
<td><a href="index.php" >zurück</a></td>  
</tr>
</table>
</form>

<?php
define ( 'MYSQL_HOST',      'localhost' );  
define ( 'MYSQL_BENUTZER',  '***' );  
define ( 'MYSQL_KENNWORT',  '***' );  
define ( 'MYSQL_DATENBANK', 'datenbank' );  
	
$db_link = mysql_connect (MYSQL_HOST, MYSQL_BENUTZER, MYSQL_KENNWORT);
if ( $db_link )
{
    echo 'Verbindung erfolgreich';  
}
else
{
    die('keine Verbindung möglich: ' . mysql_error());  
}

mysql_select_db("DATENBANK") or die  
    ("Die Datenbank existiert nicht.");  
?>