Menu sound after a little while

I wonder how could I make it an option to have a sound...

You must add a checkbox somewhere or a radio button. It could be on the homepage or in the user CP. This setting must be saved along with the user other settings in the database. Your condition in portal.php and/or index.php must check in the database if the setting is true or false for the current user (found with his member number). I dunno if it's a direct request or if a stored procedure is used. I don't even know if you guys use a sql database. These questions must be answered first.

It's a bit more difficult task than simply adding a sound effect to a page link, especially for someone who have only a bit of web programming experience.