Putting one like button on a page is very simple and comes down to pasting the code from Facebook like button generator found here.
It gets a bit more complicated when you need to add a few buttons along with a dynamically generated content. Best example would be a search results while every search result has it’s own like button.
Enough talk lets get down to the business
Prepare
Put this somewhere in your page. Let’s say just before </body> tag.
<div id="fb-root"></div>
Insert Like buttons
<fb:like href="http://example.com" send="false" layout="button_count" show_faces="false"></fb:like>
Initialize Like buttons
In your JavaScript code after inserting all the fb:like tags you need to initialize all those buttons. You can do that but running below code
window.fbAsyncInit = function() {
FB.init({appId: 'your app id', status: true, cookie: true, xfbml: true});
};
(function() {
var e = document.createElement('script'); e.async = true;
e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js';
document.getElementById('fb-root').appendChild(e);
}());
Remember to change ‘your app id’ to your actual app id.