Adding Javascript to a Quick Launch or Top Link Bar

If you ever tried adding javascript to the Quick Launch or Top Link Bar you'll find it's impossible to do so using the setting page under navigation.

Here's another alternative:

1. Enter one of the following URL's into the address bar (this depends on which of the two you want to edit).  

Quick Launch: http://<site address>/_layouts/quiklnch.aspx  

Top Link Bar: http://<site address>/_layouts/topnav.aspx

2. Enter your javascript within the web address bar and the link title within the description. 

Source: http://www.myspblog.com/2011/04/javascript-quick-launch-top-navigation.html