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<!DOCTYPE html>
<html>

<head>
<title>Javascript 3</title>
<meta charset="utf-8"/>

<script language="javascript" type="text/javascript">

function myFunction(){
		var name = document.forms.myForm.myTextbox.value;
		alert('Hello ' + name);
	};

</script>
</head>

<body>
<form id='myForm'>
<input type="text" id="myTextbox" />
<button type="button" onclick='myFunction()' > Say Hello</button>
</form>
</body>

</html>