Social share

Share = {
        vkontakte: function (purl, ptitle, pimg, text) {
            url = 'http://vkontakte.ru/share.php?';
            url += 'url=' + encodeURIComponent(purl);
            url += '&title=' + encodeURIComponent(ptitle);
            url += '&description=' + encodeURIComponent(text);
            url += '&image=' + encodeURIComponent(pimg);
            url += '&noparse=true';
            Share.popup(url);
        },
        facebook: function (purl, ptitle, pimg, text) {
            url = 'http://www.facebook.com/sharer/sharer.php?s=100';
            url += '&p[title]=' + encodeURIComponent(ptitle);
            url += '&p[summary]=' + encodeURIComponent(text);
            url += '&p[url]=' + encodeURIComponent(purl);
            url += '&p[images][0]=' + encodeURIComponent(pimg);
            Share.popup(url);
        },
        twitter: function (purl, ptitle) {
            url = 'http://twitter.com/share?';
            url += 'text=' + encodeURIComponent(ptitle);
            url += '&url=' + encodeURIComponent(purl);
            url += '&counturl=' + encodeURIComponent(purl);
            Share.popup(url);
        },
        gplus: function (purl, ptitle) {
            url = 'http://plus.google.com/share?';
            url += 'text=' + encodeURIComponent(ptitle);
            url += '&url=' + encodeURIComponent(purl);
            url += '&counturl=' + encodeURIComponent(purl);
            Share.popup(url);
        },
        popup: function (url) {
            var leftvar = (screen.width - 800) / 2;
            var topvar = (screen.height - 600) / 2;
            window.open(url, '', 'toolbar=0,status=0,width=626,height=436,left=' + leftvar + ',top=' + topvar + '');
        }
    };
    //example
    var img = document.getElementsByTagName("img")[0];
    Share.vkontakte(document.location.href, document.title, img.src, document.description);