FlipperSiteDeveloper now has a Font Sizer option on the Admin Company Page.

The Font Sizer will display on all pages of your web site once turned on and will display three images of the letter A in different sizes.  By clicking on one of the images, the font in your content areas will either increase or decrease in size or reset to the default font size.  Once a visitor chooses a font size it will be remembered for 30 days.