Conexion mysql

[muñeco]

soy nuevo en php y no puedo hacer la conexion a la base de datos mysql

este es mi codigo

echo("recuperando valores ".$nombre);
$conexion = mysql_connect("localhost","usu","pass");
mysql_select_db ("bd", $conexion);

mi me arroja este error

recuperando valores hugo
Warning: Client does not support authentication protocol requested by server; consider upgrading MySQL client in C:\Apache Server\recupera1.php on line 10

Warning: MySQL Connection Failed: Client does not support authentication protocol requested by server; consider upgrading MySQL client in C:\Apache Server\recupera1.php on line 10

Warning: Supplied argument is not a valid MySQL-Link resource in C:\Apache Server\recupera1.php on line 11

si alguien me puede ayudar de antemano gracias