Web Accessibility Standards for the Disabled

Although there are many diverse standards for web accessibility, by law all public organizations (including universities) must meet the Section 508 standards for accessibility.

Free Section 508 automated testing tools
http://wave.webaim.org
http://www.cynthiasays.com

Section 508 checklist for your web site
http://webaim.org/standards/508/checklist
http://webaim.org/standards/508/508checklist.pdf

Section 508 of the US Rehabilitation Act 
http://www.section508.gov