The Lynx web browser is a text-only browser originally developed by the University of Kansas in 1995. It is now available as free open source software that runs on both Windows and the Mac. By browsing your website with Lynx you can get a good idea of how your website will work without graphics turned on.
The Firefox web browser supports a number of toolbar add-ons that can be used to check the accessibility of your website. Two of these toolbars are the Web Developer Toolbar and the WAVE toolbar available from WebAIM.
The Web Accessibility Evaluation Tool (WAVE) is a free tool from WebAIM that will help you check your site for accessibility problems. Rather than presenting you with a lengthy technical report, WAVE shows the original web page with embedded icons and indicators that reveal the accessibility of that page.