Add facebook like button on product detail page in magento

<p><?php $currentUrl = $this->helper('core/url')->getCurrentUrl(); ?><br />
<script src="http://connect.facebook.net/en_US/all.js#xfbml=1"></script><fb:like href="<?php echo $currentUrl ?>" show_faces="false" width="450" font=""></fb:like>

 

<?php $currentUrl = $this->helper('core/url')->getCurrentUrl(); ?>
<iframe src="http://www.facebook.com/plugins/like.php?href=<?php echo $currentUrl ?>&amp;layout=standard&amp;show_faces=true&amp;width=450&amp;action=like&amp;font&amp;colorscheme=light&amp;height=80" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:80px;" allowTransparency="true"></iframe>

 

<?php $currentUrl = $this->helper('core/url')->getCurrentUrl();  ?>
<script src="http://connect.facebook.net/en_US/all.js#xfbml=1"></script><fb:like href="<?php echo $currentUrl ?>" layout="button_count" show_faces="true" width="450" font=""></fb:like></p>

 

<p><?php $currentUrl = $this->helper('core/url')->getCurrentUrl(); ?><br />
<iframe src="http://www.facebook.com/plugins/like.php?href=<?php echo $currentUrl ?>&amp;layout=button_count&amp;show_faces=true&amp;width=450&amp;action=like&amp;font&amp;colorscheme=light&amp;height=21" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:450px; height:21px;" allowTransparency="true"></iframe></p>