/**
 * Sign in as the specified user within this session.
 *
 * @author Overv
 *
 * @param username Username to sign in with.
 * @param password Associated passsword.
 * @param callback Function to pass the result to.
 */
public void login( String username, String password, final LoginCallback callback )
{
    this.username = username;
    String pwdHash = MD5( password );

    asyncWebRequest( "login.php?do=login", "do=login&cookieuser=1&vb_login_username=" + username + "&vb_login_md5password=" + pwdHash, new WebRequestCallback()
    {
        public void onResult( String source, String cookies )
        {
            if ( source != null && cookies.contains( "bb_password" ) )
            {
                bb_userid = Integer.parseInt( quickMatch( "bb_userid=([0-9]+)", cookies ) );
                bb_password = quickMatch( "bb_password=([a-zA-Z0-9]+)", cookies );

                callback.onResult( true );
            } else {
                callback.onResult( false );
            }
        }
    } );
}