You can use one of several automated tools to help you assess the accessibility of your web site. They can be very useful in helping you to identify and correct most problems. However, keep in mind that these products won’t identify all accessibility problems, and may misidentify others.
Bobby/WebXACT
This product was initially developed as “Bobby” by the Center for Applied Special Technology (http://cast.org) but has now been spun off into a suite of tools offered by Watchfire (http://watchfire.com).- Free testing of individual Pages:
http://webxact.watchfire.com/ - Desktop Application for testing entire sites:
http://www.watchfire.com/products/webxm/bobby.aspx
LIFT
Lift is a product that scans for multiple usability and accessibility issues on web sites. It includes a version that works with DreamWeaver, and another that operates as a web application.