Need some help. Easy answer. Vb phrases

[tytyguy]

hello... i am inplementing this code into my postsbit

<script type="text/javascript">
digg_url = '$vbphrase[vbseo_link_to_this_post]';
digg_bgcolor = '#EDEDED';
digg_skin = 'compact';
</script>
<script src="http://digg.com/tools/diggthis.js" type="text/javascript"></script>

My question is what do i put in the digg url? What is the phrase that makes it the curernt url. i forget what it is? $vbphrase[forum_link]? i dunno help!

so i need to know how to link to the current page i am browsing in my forum