I'm doing a web production unit in my computing course at college, and we're starting the proper web development assignment. Throughout the website development stage, we have to consider website heuristics, things like accessibility and so forth. One of the ones I'll be doing is accessibility.
I was wondering if anyone knows where I can find a tutorial, or provide a tutorial, for resizing the text within a website, if the user has eye sight problems and so forth. I know you can do it by holding down CTRL and using the mouse wheel, but I want it done on the website, so I can show the 'A A A' thing for them to choose which size.
Any help on this would be massively appreciated

Thanks.