This site uses Accesskeys and are as follows:
Internet Explorer 5+ (PC)
Hold down the ALT key, press the number or letter of the access key, release
both keys then press ENTER
Internet Explorer 4 (PC)
Hold down the ALT key and press the number or letter of the access key
Internet Explorer 5+ (Mac)
Hold down the CTRL key and press the number or letter of the access key
Mozilla and Mozilla Firefox (PC)
Hold down the ALT key and press the number or letter of the access key
Mozilla and Mozilla Firefox (Mac)
Hold down the CTRL key and press the number or letter of the access key
You can also press the TAB key to cycle through the navigation.
Text can be enlarged through your browser text menu, normally located under the VIEW menu.