Insert Facebook Like Button With Current Page's URL

// '$' is prototype library
(function(){
// use location for facebook like button
var $pg = {
url : unescape(document.location.href),
social : $('social') // id to place like button in
}
$pg.fb = '<div id="facebook"><iframe';
$pg.fb += ' src="http://www.facebook.com/plugins/like.php?href=';
$pg.fb += $page.url;
$pg.fb += '&amp;layout=button_count&amp;show_faces=true&amp;';
$pg.fb += 'width=90&amp;action=like&amp;colorscheme=light&amp';
$pg.fb += 'height=30" scrolling="no" frameborder="0" style=';
$pg.fb += '"border:none; overflow:hidden; width:90px; ';
$pg.fb += 'height:30px;" allowTransparency="true">';
$pg.fb += '</iframe></div>';
if ($pg.social) {
$pg.social.insert({ 'bottom' : $pg.fb });
};
})($);

<div id="social"></div>