Use the Check Browser behavior to send visitors to different pages depending on their browser brands and versions. For example, you may want to send visitors using Netscape Navigator 4.0 to a different page than visitors using Internet Explorer 4.0.
It’s useful to attach this behavior to the <body> tag of a page that is compatible with practically any browser (and that does not use any other JavaScript); this way, visitors who come to the page with JavaScript turned off will still see something.
Another option is to attach this behavior to a null link (such as <a href="javascript:;">) and have the action determine the link’s destination based on the visitor’s browser brand and version.