qestion about current topic link

[BOS4O]

hello
i have a button that submit my topic to the button's site but i cant't get the current topic link
the code is like this

Code Select Expand


<script type='text/javascript'>
svejo_url='CURRENT TOPIC LINK'
svejo_bgcolor='FFFFFF';
svejo_skin='compact';
svejo_theme='black';
</script>
<script src='http://svejo.net/javascripts/svejo_button.js' type='text/javascript'></script>

there i need to enter some perfix or something for the button to get automatic in what topic is it
is something like this i think <? $post_url ?> but this dosent work 

[BOS4O]

solved
i just leaved the thing in blank
ex. svejo_url=''