In order to view the TOOL correctly and not to encounter any errors, the Javascript support must be enabled in your browser.

To check that the support is enabled, you need to check the settings of the browser itself: here below are the instructions for checking some of the more common browsers.

Internet Explorer 7 - Internet Explorer 8
From the "Tools" menu choose "Internet Options", select the “Protection" option then click "Customised level". Last of all on "Protection settings", select "Activate" at option "Execute active script".

Mozilla Firefox
From the "Tools" menu choose "Options", click on "Contents", and check the checkbox "Enable JavaScript".

Opera
From the "Tools" menu choose "Preferences", choose the "Advanced" option and then "Contents" checking the "Enable JavaScript" checkbox.