window.addEvent("domready", function() {
    var log = $("log");
    var count = 0;
    var addDot = function() {
        if (count < 20) {
            this.set("text", this.get("text") + ".");
            count++;
        } else {
            log.empty();
            count = 0;
        }
    };
    var myPeriodical = addDot.periodical(50, log);
    (function() { $clear(myPeriodical); }).delay(4000);
});

http://jsfiddle.net/EXbB3/

via [http://ryanflorence.com/mootools-for-beginners-part-5-native-extensions/](http://ryanflorence.com/mootools-for-beginners-part-5-native-extensions/)

MooTools Dots Loading Indicator

javascript

JavaScript