Dynamic Links in the LIKE button

I'm trying to add a LIKE button using the facebook developers form here - http://developers.facebook.com/docs/reference/plugins/like/

I'd like the button to work for every page though and I'm not sure how to do it (dynamic pages). So a url for example would be www.mysite.com/page.php?id=2

So in the "URL to Like" box I put http://www.mysite.com/page.php?id=<?php echo $id; ?> and made a variable to grabe the page id, but when I make the button it doesn't return the specific page, it just goes to page.php with no id#

Any ideas?

 

add:
&href=http://www.mysite.com/page.php?id=<?php echo $id; ?>
to your code

 

Thanks, all sorted now!