<head>
<script language="javascript">
<!--
function greet()
{document.form3.txtgreet.value="hello "+document.form3.txtname.value
}
//-->
</script>
</head>
<body>
<form name="form3">
Enter first name<br>
<input type ="text" name="txtname"><br>
click here
<input type="button" value="greet" onclick="greet()"><br>
<input type ="text" name="txtgreet">
</form>
</body>
</html>