in static/js/glossary.js [140:151]
$(this).click(function() {
var targetId = $(this).data("target");
var shouldExpand = $(this).html() == expandText;
if (shouldExpand) {
$("#" + targetId).removeClass('hide');
$(this).html(closeText);
} else {
$("#" + targetId).addClass('hide');
$(this).html(expandText);
}
});