function optionValue(e) {
   // parse value of element's selected option
   return parseInt(e.options[e.selectedIndex].value);
}

function calculate() {
   var s = 0;
   var pass = 65;
   var fail = 0;
   var A_ = 91;
   var B = 80;
   var boost = .05;

   with (document.criteria) {
      s += (success.checked) ? pass : fail;
      s += optionValue(framerate);
      var c = optionValue(complexity);
      var f = optionValue(filesize);
      s += c / f;
      s += optionValue(effort);
      s += optionValue(novelty);
      s += optionValue(awe);
      if (s > B) {
          var max = 100 - A_;
          var amount = Math.min((100 - s), max) / max;
          s *= 1 + (boost * amount);
      }
      score.value = Math.round(s);
   }
}