Tryit Editor v2.3

Edit This Code:
<!DOCTYPE html>
<html>
<head>
<script
src="http://ajax.googleapis.com/ajax/libs/prototype/1.7.2.0/prototype.js">
</script>
<script>
function myFunction() {
    $("h01").insert("Hello Prototype!");
}
Event.observe(window, "load", myFunction);
</script>
</head>
<body>
<h1 id="h01"></h1>
</body>
</html>