<html>
<head>
<script type = "text/javascript">
<!--
function getValue() {
var retVal = prompt("Enter your name : ", "your name here");
document.write("You have entered : " + retVal);
}
//-->
</script>
</head>
<body>
<p>Click the below button to see the result: </p>
<form>
<input type = "button" value = "Click Me" onclick = "getValue();" />
</form>
</body>
</html>