MD5 & Auth class

Dears,I have changed my code,But i don't recv
"okkkkkkkkk" message in browser.
My code is :
<?
set_include_path(get_include_path().'/'.'auth');
include_once('Auth/Auth.php');
function x(){echo "xxxxxxxxxxxxxxxxxxx";}
mysql_pconnect('localhost',"root",'');
mysql_select_db('mem');
$x=MD5('mohsen');
mysql_query("insert into  usernames values
(pass='$x',user = 'jiq');");

$parameterforauth=array("dsn"=>"mysql://jiq:mohsen@localhost/mem",
"table"=>"usernames",
"usernamecol"=>"user",
"passwordcol"=>"pass");
$ptr_auth_C=new auth("DB",$parameterforauth,"x");
$ptr_auth_C->start();
if ($ptr_auth_C->getAuth())
echo "okkkkkkkkkkkkkkk";
?>
What's my problem?
Yours,Mohsen......

=====
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///Mohsen Pahlevanzadeh////////
Network administrator  & programmer
My home phone is: +98213810146
My email address is
m_pahlevanzadeh at yahoo dot com
My website is: http://webnegar.net
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