Thanks for the kind words about the website.
Blicj11 : I've PMed you.
In summary, WeatherCat uploads a barebones file with tags and values e.g. <currentTemp>15c to an upload page, the Wordpress page has JS source in there which uses XMLHttpRequest to get the uploaded page, it outputs the content to a DIV tag which is then parsed to get the values, which are then used to set the innerHtml on various embedded tags in the Wordpress page.
Hugely grateful to WeatherCat for making the s/w for the Mac, after years of having to run rather unreliable and overly complicated s/w on a (Vista!) PC whose only purpose was to update the website, which finally gave up the ghost last year!
Steve