How to get thread URL?

[hurricane_sh]

I want to integrate a digg button in SHOWTHREAD template with the following JavaScript code:

<script type="text/javascript">
digg_url = 'WEBSITE_URL';
</script>
<script src="http://digg.com/tools/diggthis.js" type="text/javascript"></script>

What should I use to replace WEBSITE_URL? Since I want to use only one URL for a thread, window.href.location doesn't work correctly, it will give different URL for multi-page thread.

Thanks!

[hurricane_sh]

Solved.