How to make these social sharing buttons to work?

jQuery(function($){

    $(".share-button").click(function(event){
        event.preventDefault();
        var service = $(this).data('service');
        switch(service) {
            case 'facebook':
                url = ( LeadPageData['facebookurl']['value'] ? LeadPageData['facebookurl']['value'] : document.URL);
                window_size = "width=585,height=368";
                go = 'http://www.facebook.com/sharer/sharer.php?u=' + url;
                break;
            case 'twitter':
                url = ( LeadPageData['twitterurl']['value'] ? LeadPageData['twitterurl']['value'] : document.URL);
                window_size = "width=585,height=261";
                go = 'http://www.twitter.com/intent/tweet?url=' + url;
                break;
            case 'google':
                url = ( LeadPageData['googleurl']['value'] ? LeadPageData['googleurl']['value'] : document.URL);
                window_size = "width=517,height=511";
                go = 'http://plus.google.com/share?url=' + url;
                break;
            default:
                return false;
        }
        window.open(go, '', 'menubar=no,toolbar=no,resizable=yes,scrollbars=yes,' + window_size);
    });

});

<a href="http://domain-name.com" id="section-content-sharing-facebook" data-service="facebook" class="share-button"><img src="img/facebook.gif"></a>
<a href="http://domain-name.com" id="section-content-sharing-twitter" data-service="twitter" class="share-button"><img src="img/twitter.gif"></a>
<a href="http://domain-name.com" id="section-content-sharing-google" data-service="google" class="share-button"><img src="img/google.gif"></a>

url = 'place your URL here';