title: adding a new wpdb class in wordpress
body: <p>I want to add a new class wpdb                                                         <strong>$wpdb1 = new wpdb(my_db_login, my_db_password, my_DB_NAME,my_DB_HOST);</strong> for my wordpress blog but I don't know where.
  when I put it the following class in wp-config i got this error message
  Fatal error: Class 'wpdb' not found in line 80 , sorry i'm a wordpress beginer  </p>