UPDATE stukje script.

<?php
$aLevel = array(1, 2, 3);
if($_SERVER['REQUEST_METHOD'] == "POST")
{
	if(Is_Numeric($_POST['id']) AND In_Array($_POST['level'],$aLevel))
	{
		mysql_query("UPDATE tco_members SET level='".mysql_real_escape_string($_POST['level'])."' WHERE id='".mysql_real_escape_string($_POST['id'])."'");
		echo "Bewerkt.";
	}
	else
		echo "Er is wat mis gegaan.";
}
else
{
	echo "<form method='post'>
	<input type='text' name='id' /><br />
	<select name='level'>";
	for($i = 1; $i <= 3; $i++)
		echo "<option value='".$i."'>".$i."</option>";
	echo "</select><br />
	<input type='submit' value='Bewerk' />
	</form>";
}
?>

<?php
$aLevel = array(1, 2, 3);
if($_SERVER['REQUEST_METHOD'] == "POST")
{
	if(Is_Numeric($_POST['id']) AND In_Array($_POST['level'],$aLevel))
	{
		mysql_query("UPDATE tco_members SET level='".mysql_real_escape_string($_POST['level'])."' WHERE id='".mysql_real_escape_string($_POST['id'])."'");
		echo "Bewerkt.";
	}
	else
		echo "Er is wat mis gegaan.";
}
else
{
	echo "<form method='post'>
	<input type='text' name='id' /><br />
	<select name='level'>";
	for($i = 1; $i <= 3; $i++)
		echo "<option value='".$i."'>".$i."</option>";
	echo "</select><br />
	<input type='submit' value='Bewerk' />
	</form>";
}
?>