The only image tag that seems to work on all my browsers has been the title="something"...
![Confused :?](./images/smilies/icon_e_confused.gif)
One warning, thought, the alt="" MUST be in included the <img /> tag to meet the W3C standards.
OK, now getting back to the original message...
I have added some stuff into the template and the JavaScript file that display the mouse-over messages to include the 3 missing gauges (wind compass, wind gauge and wind rose: histogram) - the 3 gauges now have title above the images as well as mouse-over information.
Not perfect but better than the original gauges - have a look at the following link:
[link removed]