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Solved! Thanks to the guys from the Google forums. Here's the link: http://techqi.blogspot.com/2008/02/grade-calculator-for-university.html Updated Feb 20 3:13 PST Here's the code that I'm actually interested in. I intend to use it in a Blogger widget, so that my students can just visit the webpage and calculate their grades. I've tested it on my system and it works fine. However, the W3C Markup Validation Service and JSLint and still finds errors, a lot of which doesn't seem to make sense (e.g. assumes ">" missing in cases perfectly okay). Why does it work on my system, then? I'm actually an interested novice in HTML/JavaScript/blogging, and haven't ever used Firebug or similar plugins. Help, please!