Plugin that uses the service of http://browser-update.org
This service is an opportunity to inform your visitors unobtrusively to update or switch to a newer browser.
The user will be notified only once, and won't be bothered any more. The notification bar is very small and won't affect the browsing experience negatively.

Supports Internet Explorer, Firefox, Opera, Safari, Netscape and Chrome.

The plugin is installed on Webenet.nl. The notification can only be seen when using an outdated browser such as IE6.

Installation Instructions

Download the package and unzip it.

Installation:
  In the Manager create a new plugin called BrowserUpdate
    and copy/paste this code into the new plugin
  Click on the tab Configuration and copy and past the next line into the Plugin configuration field:
     &checkBrowser=Check browser;list;default,custom;default;&ie=Internet Explorer;string;6;&ff=Firefox;string;2.0;&opera=Opera;string;10.01;&safari=Safari;string;2.0;&netscape=Netscape;string;10;&reminder=Reminder;string;0;&language=Language;string;default;&testMode=Test  mode;list;true,false;false;;&newWindow=Open in new window;list;true,false;true
  Click on the tab System Events and check the next event(s):
    OnWebPagePrerender

More instructions are included in the plugin source.