<html>
<body>
<script language="JavaScript">
function function1(){
document.getElementById("myButton").blur();
document.getElementById("myButton").innerText = "This button lost its focus";
alert("The button lost its focus");
}
</script>
<input id="myButton"
type="button"
onclick="function1();"
value="Tab to put in focus." onFocus="this.innerText='In focus. Click me to lose focus'">
</body>
</html>