Facebook invite freidns script

[SimonIoa]

Hello i have implemented a Facebook invite friends script to my website so that my users may invite their facebook friends to the website. The scripts show only one of the friends and there is no option (link or what ever) for the user to invite even the one friend to the website. Here is the code? Does anyone knows something better than me?

<?php

$sApplicationId = '349547122654312';
$sApplicationSecret = 'e35030c2511342a692345e4fce16817c';
$iLimit = 99;

?>

        <center>
            <h1>Authorization step:</h1>
            <div id="user-info"></div>
            <button id="fb-auth">Please login here</button>
        </center>

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

        <script>
        function sortMethod(a, b) {
            var x = a.name.toLowerCase();
            var y = b.name.toLowerCase();
            return ((x < y) ? -1 : ((x > y) ? 1 : 0));
        }

        window.fbAsyncInit = function() {
            FB.init({ appId: '<?php echo $sApplicationId; ?>', 
                status: true, 
                cookie: true,
                xfbml: true,
                oauth: true
            });

            function updateButton(response) {
                var button = document.getElementById('fb-auth');

                if (response.authResponse) { // in case if we are logged in
                    var userInfo = document.getElementById('user-info');
                    FB.api('/me', function(response) {
                        userInfo.innerHTML = '<img src="https://graph.facebook.com/' + response.id + '/picture">' + response.name;
                        button.innerHTML = 'Logout';
                    });

                    // get friends
                    FB.api('/me/friends?limit=<?php echo  $iLimit; ?>', function(response) {
                        var result_holder = document.getElementById('result_friends');
                        var friend_data = response.data.sort(sortMethod);

                        var results = '';
                        for (var i = 0; i < friend_data.length; i++) {
                            results += '<div><img src="https://graph.facebook.com/' + friend_data[i].id + '/picture">' + friend_data[i].name + '</div>';
                        }

                        // and display them at our holder element
                        result_holder.innerHTML = '<h2>Result list of your friends:</h2>' + results;
                    });

                    button.onclick = function() {
                        FB.logout(function(response) {
                            window.location.reload();
                        });
                    };
                } else { // otherwise - dispay login button
                    button.onclick = function() {
                        FB.login(function(response) {
                            if (response.authResponse) {
                                window.location.reload();
                            }
                        }, {scope:'email'});
                    }
                }
            }

            // run once with current status and whenever the status changes
            FB.getLoginStatus(updateButton);
            FB.Event.subscribe('auth.statusChange', updateButton);    
        };

        (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>