<html>
<head>
<link id="style1" rel="stylesheet" type="text/css" href="/demo/style1.css">
<script>
function displayResult()
{
document.getElementById("style1").href="style2.css";
}
</script>
</head>
<body>
<h1>My Web Page</h1>
<button type="button" onclick="displayResult()">Switch style sheet</button>
</body>
</html>