Terrycoco/gist:26bfc82e6b91ca9ae42f

## gistfile1.html
<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>Ping Pong!</title>

</head>
<body>
<h1>Terry's Ping Pong!</h1>
<div id="myDiv"></div>
<script>
    function pingPong() {
        var num = prompt("How many volleys would you like?", "25");
        var div = document.getElementById("myDiv");
        var html = "";

        if (typeof num != "undefined" && !isNaN(num) ) {
            for (var i = 1; i <= num; i++) {
                var li = "";
                if (i % 3 == 0) {
                    li = "ping";
                }
                if (i % 5 == 0) {
                   li += (li ? "-pong" : "pong");
                }
                html += ("<li>" + (li || i) + "</li>")
            }
            div.innerHTML = html;
        } else {
            div.innerHTML = "<p>Oops.  You didn't enter a number!</p>";
        }
    }

    window.onload = pingPong;
</script>
</body>
</html>
	<!DOCTYPE html>
	<html>
	<head lang="en">
	<meta charset="UTF-8">
	<title>Ping Pong!</title>

	</head>
	<body>
	<h1>Terry's Ping Pong!</h1>
	<div id="myDiv"></div>
	<script>
	function pingPong() {
	var num = prompt("How many volleys would you like?", "25");
	var div = document.getElementById("myDiv");
	var html = "";

	if (typeof num != "undefined" && !isNaN(num) ) {
	for (var i = 1; i <= num; i++) {
	var li = "";
	if (i % 3 == 0) {
	li = "ping";
	}
	if (i % 5 == 0) {
	li += (li ? "-pong" : "pong");
	}
	html += ("<li>" + (li \|\| i) + "</li>")
	}
	div.innerHTML = html;
	} else {
	div.innerHTML = "<p>Oops. You didn't enter a number!</p>";
	}
	}

	window.onload = pingPong;
	</script>
	</body>
	</html>