/ Published in: JavaScript
                    
                                        
via [http://ryanflorence.com/mootools-for-beginners-part-5-native-extensions/](http://ryanflorence.com/mootools-for-beginners-part-5-native-extensions/)
                
                            
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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);
});
URL: http://jsfiddle.net/EXbB3/
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