Mi lehet a hiba?

<?php

$username = $_POST[username];

$password = $_POST[password];

$kapcsolat = mysql_connect('minden.sql.freeweb.hu', 'minden', 'formula1');

mysql_select_db('minden');

$parancs = "SELECT * FROM minden WHERE username = '$username";

$valsz = mysql_query($psrancs);

$sor = mysql_fetch_array($valasz);

print $sor[password];

?>