update

<?php
require_once ("koneksi.php");

//mengambil nilai dari form
$id_tamu=(int)$_POST['id_tamu'];
if($id==0){
die('<pre>'.print_r($_POST,1).print_r($_GET,1));
}
$nama = $_POST['nama'];
//$alamat = $_POST['alamat'];

$update = mysql_query("UPDATE tes SET nama WHERE id_tamu = '$id_tamu'");

if ($update){
//echo "sukses update data";
?><script>alert('sukses update data');
document.location.href="tampil_tamu.html";
</script><?php
}else{
echo "gagal : ".mysql_error();
}
?>