WordPress: Facebook Like Button

//Facebook Like Button para usar nos arquivos: page.php e single.php

function facebook_like(){
    global $post;
    $url = urlencode(get_permalink($post->ID));
    $button = '<iframe src="http://www.facebook.com/plugins/like.php?href='.$url.'&amp;layout=standard&amp;show_faces=true&amp;width=330&amp;action=like&amp;font=tahoma&amp;colorscheme=light&amp;height=80" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:330px; height:80px;" allowTransparency="true"></iframe>';

    echo $button;
}

/*
Coloque <?php facebook_like() ?> onde quiser que o botão apareça
*/