plz , can help me for this problem

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HTTP Error 500 (Internal Server Error): An unexpected condition was encountered while the server was attempting to fulfill the request.
[30-Jan-2012 01:34:44] PHP Fatal error: Access denied for user 'hag12'@'localhost' (using password: YES) in /home2/misanuni/public_html/hajj/Connections/config.php on line 9
and my conifig
# FileName="Connection_php_mysql.htm"
# Type="MYSQL"
# HTTP="true"
$hostname_config = "localhost";
$database_config = "hag";
$username_config = "hag12";
$password_config = "hag12";
$config = mysql_pconnect($hostname_config, $username_config, $password_config) or trigger_error(mysql_error(),E_USER_ERROR);