Updated version is up, which should now work properly. Also offers checking of Bitstamp. (I'm having some issues with BTC-E at the moment, so that's disabled.)
The new version uses a php proxy/cache: this is to avoid the browser caching the json from the Exchange (by setting no-cache headers), and also to allow access to APIs that are only accessible via SSL (i.e. every exchange apart from Mt. Gox only lets you access the API via SSL -- the browser won't let js on a non-SSL site to access SSL sites and vice versa). Note that this new cache only updates externally at most once a minute, so setting your update time to less than 1 minute only means that your browser will contact my server more often, but my server still only contacts the exchanges at most once per minute.
The new version uses a php proxy/cache: this is to avoid the browser caching the json from the Exchange (by setting no-cache headers), and also to allow access to APIs that are only accessible via SSL (i.e. every exchange apart from Mt. Gox only lets you access the API via SSL -- the browser won't let js on a non-SSL site to access SSL sites and vice versa). Note that this new cache only updates externally at most once a minute, so setting your update time to less than 1 minute only means that your browser will contact my server more often, but my server still only contacts the exchanges at most once per minute.
Interesting colour scheme you used there lol.
I'm just living up to the stereotype that people who can code can't design UIs...