Facebook Share button within Facebook

1.Create a javascript function:

 function sharePost() {
FB.ui(
  {
    method: 'stream.publish',
    attachment: {
      name: 'test',
 media:[{type:'image',src:'logo.jpg',href: 'www.facebook.com/test'}],
      description: ('Test.' ),
      href: 'http://www.facebook.com/pages/test/11111111?sk=app_111111111'
    }
  });
return false;
}

2. Add click event to the a tag.

<a href="#" onclick="sharePost(); return false;"  >button</a>


3. Add facebook init.


<div id="fb-root"></div>
<script>
window.fbAsyncInit = function() {
FB.init({appId: "11111111",
             status: true,
             cookie: true,
             xfbml: true});
FB.Canvas.setSize({width: 520, height: 1200});
};
(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);
}());


</script>