To enlarge the entire page in your browser hold down the Control Key and hit the + (plus) key.
To shrink the entire page in your browser hold down the Control Key and hit the - (minus) key.
Control Key and 0 (zero) will reset the page to default size.
If using a Mac, use the Command Key in place of the Control Key.
This works with Firefox, Safari, Chrome, Internet Explorer versions 7 and 8.