Slider menu: want to change the size dynamically

Hi All,
I am using code from the site, http://www.kirupa.com/developer/mx2004/menu_with_slider.htm and I would like to make my slider smaller or bigger depending on the link. I’m guessing it can be done with action script, but have no idea how to do it.

To view my file it’s at: http://vein-specialists.com/final.html
the FLA is at:http://vein-specialists.com/FLA/menu.fla
Sadly, I need to squeeze one more link on the top menu and I am running out of room.

thanks for any help.
Jan:ko: