I've got a working deviantArt webapp, the message counts are working, although they never change. I'd like to refresh the webpage they're on so we get new totals. Is there any way of doing that?
I don't think reloading a webpage without direct command from user is a good idea. Imagine yourself reading something then suddenly browser reloads the page.
Better approach would be getting massage count from API or something, or requesting another page once in a while (via ajax) and fetching message-count and others from there.
I'm not sure if you can use jQuery or not because your script might be loaded before everything else and it is not used in tutorials. I don't think depending on jQuery would be good idea anyway.