ivanrazine

I’m just glad you made it 🙂

You have to make sure jQuery is only inserted once before any other code.

I had the same problem, the same Firebug console error and I solved it by making sure no plugin inserted jQuery.

If it doesn’t help, you should probably write a cleaner menu code by yourself, here is my example: Demo

You may also add this code to your functions.php :

<?php
function my_init_method() {
    if (!is_admin()) {
        wp_deregister_script( 'jquery' );
        wp_register_script( 'jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js');
        wp_enqueue_script( 'jquery' );
    }
}    

add_action('init', 'my_init_method');
?>