Html - Code Button

<!DOCTYPE html>
<html>
<a id="myButton" href="#">
    click here to get random stuff
</a>

<div id="myRandomDiv">
</div>

<script type="text/javascript" charset="utf-8">
    var randomStrings = [
        "hello 1",
        "hello 2",
        "hello 3",
        "hello 4",
        "hello 5",
    ];


    var randomDiv = document.getElementById("myRandomDiv");

    document.getElementById("myButton").addEventListener("click", function() {
          randomIndex = Math.ceil((Math.random()*randomStrings.length-1));
          newText = randomStrings[randomIndex];
          randomDiv.innerHTML = newText;
    });
</script>

</html>