facebook like button on category

Hi,

I have added facebook like button on the category page. when you press it, it shows up on your facebook wall. but, it says that you like the latest post in that category. I want it to like the category, only… i use this code:

<div class="fbLike">
		<iframe src="https://www.facebook.com/plugins/like.php?href=<?php echo urlencode(get_permalink($post->ID)); ?>&layout=button_count&show_faces=false&width=450&action=like&colorscheme=light" scrolling="no" frameborder="0" allowTransparency="true" style="border:none; overflow:hidden; width:150px; height:25px;"></iframe>
</div>

any ideas?