Actually, if you pull the file directly it isn’t corrupted. http://www.willowsfordfarmweather.org/scripts/gauges.js
So it must be because the containing page is XHTML 1.0 Transitional. The gauges were designed for HTML 5 and UTF8 encoding. However lots of other people are using them with the Saratoga template so they can be made to work, but I’m not sure how they have done it at the moment…