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<html><body><p><a id="myAnchor" href="http://www.microsoft.com">www.microsoft.com</a></p><p>Click the button to change the value of the href attribute of the link above to "www.cnn.com".</p><button onclick="myFunction()">Try it</button><p id="demo"></p><script>function myFunction() { document.getElementById("myAnchor").href = "http://www.cnn.com/"; document.getElementById("demo").innerHTML = "The link above now goes to www.cnn.com.";}</script></body></html>