Ok, fixed it now. Because you're putting the script tags in the document head, it's failing when it tries to add the dimmer and box to the document body, because that doesn't exist yet. I've changed it so it waits for the window onload event before adding the elements (unless you specify the no_wait option). New version uploaded to my site.
Also, you should put script tags at the end of the document, just before the closing body tag, as they block page rendering until the files they reference have been loaded and parsed. This isn't so bad if you're just loading files from your own server, but if you ever need to load external ones (e.g. jQuery from the Google CDN) it could make your page appear to load slower than necessary.
Also, you should put script tags at the end of the document, just before the closing body tag, as they block page rendering until the files they reference have been loaded and parsed.
Alternatively, you should put script tags in the head of the document because they block page rendering until the files they reference have been loaded and parsed, and that means you don't get a page that has rendered but is buggy and unresponsive because only half the scripts have loaded. :@
I've also updated it so it will still work even if you put the script tags in the head and use the no_wait option; in such a case it'll just pretend you didn't use no_wait.
The head is where script files have always been intended to go - the blocking of loading is deliberate. It's a relatively recent fad of "optimising" pages by putting them at the end.
As above, it means that the page can load and look like it's ready before any of the JavaScript is actually executed, which is especially a pain when people use files on a slow CDN, and you have to sit waiting before you can interact with a page.