Winamp's JavaScript API doesn't work

Hello! I recently started playing around with the '

Winamp JavaScript API [JSAPI2]' (ml_webdev.dll)

I have made a small script that gets the artist from the API

JavaScript Code:

code:
var artist = window.external.Transport.GetMetadata("artist");

alert(artist);

console.log(artist);

HTML Code:

<html>
<head>
	<meta http-equiv="content-type" content="text/html;charset=utf-8">
	<script src="main.js"></script>
</head>
</html>

That should execute the script, but when I load it, nothing happens :/
Only the JSAPI2 Test works...
Am I missing something?
Thanks.

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