javascript file not working when linked from HTML
You are using jQuery, but it doesn't seem like you have included it. Add this to your HEAD element
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>
You need to import jQuery.
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>
Actually, i had a problem like this and i tried the code below.
<head>
<meta charset="ISO-8859-1">
<title></title>
<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>
</head>