There are several ways to solve the problem of browsers caching AJAX requests. You can use a 'cache buster' parameter, or you can set the response headers server-side. This article discusses these two options.
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How to stop Internet Explorer from caching AJAX requests
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Use CSS pseudo classes to enhance accessibility
It is very simple to add some CSS rules to make your site more accessible. Read on to find out how you can use pseudo classes to provide extra support for keyboard users in all browsers (including Internet Explorer).
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Problems tabbing through checkboxes and radios in MacOSX Safari
Many people find it easier to use the tab key to cycle through the various fields of a form in a web page. If you are using a browser in MacOSX, you will find that you cannot use the tab key to access checkboxes or radio buttons... instead you have to use the mouse/trackpad. Read on for a solution.