php would be easiest.. otherwise this might work for you.
HTML Code:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>mailto with location</title>
</head>
<body>
<p>Welcome.
<script type="text/javascript">
var subj = encodeURI("Have a look at this:- " + window.location.href);
var body = encodeURI("You might find this interesting:- ") + "%0A%0A" + encodeURI(window.location.href);
document.write("<a href=\"mailto:?subject=" + subj + "&body=" + body + "\">Send link to a friend</a>");
</script>
<noscript>You do not have Javascript enabled so you cannot send the message.</noscript>
</p>
</body>
</html>
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