test1.html

<html>
	<head>

		<script type="text/javascript" src="jquery.js"></script>
		<script type="text/javascript">


			$(document).ready(function(){

					$('[href="#"]').click(function() {
						$('#' + $(this).data('id')).load($(this).data('url'));
						});


					});


</script>
				</head>

				<body>
					<form>
						<input type = "text" name = "username">
						<input type = "text" name = "passsword">
					</form>

					<div id = "content">

						<p> it will be replaced </p>
					</div>
					<a href="#" data-url="hello.txt" data-id="content">click here</a>

				</body>
			</html>