Text throughout the site (including navigation) can be made bigger or smaller within the browser to suit your needs.
open the View menu and choose from the options under Text Size
or use CTRL and + to increase the size and CTRL and - to decrease the size.
In Internet Explorer:
open the View menu and choose from the options under Text Size.
Note: If you use a Mac you should hold down the Apple/Command key and press the + or - key.