The following code can be used to integrate the Facebook Like button into any website in a W3C-compliant manner:
<object class="object1" data="//www.facebook.com/plugins/like.php?href=http%3A%2F%2Fwww.econcess.de&send=false&layout=button_count&width=250&
show_faces=false&action=like&colorscheme=light&font=arial&height=20"></object>
