na podstawie skryptu sciagnietego z tej strony napisalem to co chcialem, tzn wysylanie zachaszowanego hasla md5, bedzie on w $_POST[md5].
<script src="md5.js"></script>
<script language="JavaScript"><!--
function login(f) {
f['md5'].value = hex_md5(f['password'].value);
f['password'].value = '';
return true;
}
//--></script>
<noscript>
<p>Enable JavaScript for safe login.</p>
</noscript>
<form action="user_dodaj.php" method="post" onSubmit="return login(this);">
<?php
mysql_query("INSERT INTO users (id_usera) VALUES (NULL)");
?>
<input type="hidden" name="id" value="<?php echo mysql_insert_id(); ?>">
<input type="hidden" name="md5" value="">
Login: <input type="text" name="user"><BR>
Password: <input type="password" name="password">
<input type="submit" value="Login">
</form>