Display Alphabets by setInterval() Function

This page is built based on one and half year old tiny person's idea. My son AARON loves reading alphabets. I thought I could show alphabets one by one with a time interval and of course with bigger fonts. I used setInterval() function to write a little script to make him happy.

Below is the little script that is used to display alphabets_

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var alphBtID;
var alphBtsCount = 0;
var alphBts = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
 
function alphBtsStart() {
    if (alphBtID) {
        clearInterval(alphBtID);
    }
    alphBtID = setInterval(function () {
        document.getElementById("alphBtsPanel").innerHTML = alphBts.charAt(alphBtsCount);
        alphBtsCount++;
    }, 2500);
};