Send Button pop-over not appearing

Hello.I’m trying to integrate the Facebook Like+Send buttons onto my website. I’m using the code below. The Like button works fine, but the Send button doesn’t. You can click on the Send button and it turns gray like it should, but no pop-over appears where you can actually send the article.Any ideas? Thanks.

<iframe src="http://www.facebook.com/plugins/like.php?href=<?php the_permalink();?>&send=true&layout=standard&width=450&show_faces=false&action=recommend&colorscheme=light&font&height=35" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:35px;" allowTransparency="true"></iframe>