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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Listing 4-18. Code</title>
</head>
<body>
<pre><code>
function helloWorld() {
var button = document.getElementById("button");
if (button) {
button.onclick = function(){
alert("Hello world!");
}
}
}
</code></pre>
</body>
</html>
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