<!doctype html>
<html>
<head>
<script src="js/jquery/1.11.3/jquery.min.js"></script>
</head>
<body>
<form>
<input id="id-fname" type="text" value="">
<input id="id-lname" type="text" value="">
</form>
<script>
$( "#id-fname" ).focus(function() {
$('#id-fname').val('Enter first name');
});
</script></body>
</html>