adjustable font size

I have seen on a few sites a feature whereby a visitor can click on  

a hotspot that will increase the size of the font in the main article
on a page. The best example is on The New Yorker site. You see it
just above the photo on this page:

http://www.newyorker.com/arts/critics/books/
2009/03/09/090309crbo_books_updike

Reuters also has it:
How is this done with Freeway?

TIA


							Peter

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