Add facebook 'like button' to xcart productpages, and to main page.

Add facebook 'like button' to xcart productpages, and to main page. I need 2 things: 1) Add the like button/plugin to the x-cart productpages of our webshop. Important is that the url is variable per product of course. 2) Add the 'find us on facebook' plugin to our homepage, so it shows a content block with 'xxx people like this.