$gTotal = 0;
while($menu=mysql_fetch_array($pesanan))
{
$tot=$menu[harga]*$menu[jumlah];
echo "<tr>";
echo "<td>$menu[nama_menu]</td>";
echo "<td><div align='center'>$menu[jumlah]</td></div>";
echo "<td><div align='center'>$menu[harga]</td></div>";
echo "<td><div align='center'>$tot</td></div>";

$gTotal = $gTotal + $tot;

}

echo "</tr></table>";

echo "Total Pembelian Anda : Rp. $gTotal<br>";
echo "Bayar : Rp. <input name='bayar' type='text' id='bayar' />";
echo "<input name='proses' type='submit' id='proses' value='Click' />";
echo "<input name='kembali' type='text' id='kembali'/>";
echo "</form>";