Actionscript modifications

I need to modify the actionscript in a template to add a button in the menu. Right now the logo serves as the button to go back on the home page. I would like to keep the logo as is but I need to add the Home page textname in the menu bar and to have it disable when we first get on the site and then activate it when we change page. I need the same fonctionality as it is right now for the rest of the menu. ie active state, disable state and the deep linking fucntionality(this is already implemented in the template). here's the template url [login to view URL]