The page is Ajax based and uses the JQuery library to pull a JSON formatted data file from your web server to update the gauge values. By default the page is configured to update every 60 seconds.
Each gauge has has an optional pop-up information box that contains some additional text based data for today, and a graph of recent trends for relevant values.
Please note that these gauges use HTML5 ‘features’ and so will not run on older browsers, in particular versions of Internet Explorer prior to IE9. Also if you are planning on embedding the code in an existing page, then the whole page should be converted to the HTML5 standard.