Technical requirements

JavaScript.

JavaScript should be enabled in your browser. 
If you are unable to view the JSmol and JSpecview components, and your browser is HTML 5 compatible, enable JavaScript in your browser.

Having trouble finding the JavaScript settings, check your browser on: http://activatejavascript.org/

Browser HTML 5 support.

Your browser should support HTML 5.
If you are unable to view the JSmol and JSpecview components, and JavaScript is enabled in your browser, update your browser to a newer version.

Test your browsers HTLM 5 compatibility on:
http://html5test.com/