help needed. Colour change on website

Hello



Im designing a website for my university project and was wondering whether,
it would ok to put a button on a web page, to allow the user to change the
colour of the background. Or would it be better not to include this feature
(as blind users will not be able to use this feature) ? I look forward to
hearing from you. The URL for my website is:

http://students.comp.glam.ac.uk/05018994/homepage.html

Best Regards

Johney Harriott