Does not work on actual page

Is the jquery library being loaded in the header section of your site?

This line of code might help, it goes in the functions.php file.
// Load jQuery
if ( !is_admin() ) {
wp_deregister_script(‘jquery’);
wp_register_script(‘jquery’, (“https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js”), false);
wp_enqueue_script(‘jquery’);
}