Post to your Facebook wall using Javascript SDK

Step1:

<div id="fb_div">
    <h3>Post to your Facebook wall:</h3> <br />
    <textarea id="fb_message" name="fb_message" cols="70" rows="7"></textarea> <br />
    <input type="button" value="Post on Wall" onClick="post_on_wall();" />
</div>

Step 2:

window.fbAsyncInit = function()
{
    FB.init({
        appId  : 'xxxxxxxxxxxxxxx',
        status : true, // check login status
        cookie : true, // enable cookies to allow the server to access the session
        xfbml  : true , // parse XFBML
        oauth : true // Enable oauth authentication
    });


};

function post_on_wall()
{
    FB.login(function(response)
    {
        if (response.authResponse)
        {
            alert('Logged in!');

            // Post message to your wall

            var opts = {
                message : document.getElementById('fb_message').value,
                name : 'Post Title',
                link : 'www.postlink.com',
                description : 'post description',
                picture : 'http://2.gravatar.com/avatar/8a13ef9d2ad87de23c6962b216f8e9f4?s=128&d=mm&r=G'
            };

            FB.api('/me/feed', 'post', opts, function(response)
            {
                if (!response || response.error)
                {
                    alert('Posting error occured');
                }
                else
                {
                    alert('Success - Post ID: ' + response.id);
                }
            });
        }
        else
        {
            alert('Not logged in');
        }
    }, { scope : 'publish_stream' });
}

Step3:
create a div with id=”fb-root” and paste below code after this div

<div id="fb-root"></div>

Step4:

(function() {
    var e = document.createElement('script');
    // replacing with an older version until FB fixes the cancel-login bug
    e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js';
    //e.src = 'scripts/all.js';
    e.async = true;
    document.getElementById('fb-root').appendChild(e);
}());