<html>
<head>
<script language="JavaScript">
function function1() {
var m = event.altKey;
if (m == false) {
alert("The Alt Key is not pressed");
document.all.myButton.value = "Click here while pressing the Alt key";
} elseif(m == true) {
alert("The Alt Key is pressed");
document.all.myButton.value = "Click here";
}
}
</script>
</head>
<body>
<input id="myButton" type="button" value="Click here" onClick="function1();">
</body>
</html>