Typewrite Effect - with loop

Hi,

i´ve found this code with typewrite simulation,

but just work for one sentence. how can i change the code to use for more sentences and with loop?

function typewriter(textBox:TextField, string:String, speed:int):void {

    var stringLength:Number = string.length;
    var counter:Number = 1;

    function wait() {

        if(counter == stringLength) {

            clearInterval(myTimer);

        }

        textBox.text = string.substr(0,counter);
        counter++;

    }

    var myTimer = setInterval(wait, speed);

}

typewriter(textbox, "Semper et ubíque unum ius", 50);