var Footer = function () {
    return {
        OpenTwitter: function (url) {
            var left = (screen.width / 2) - (626 / 2);
            var top = (screen.height / 2) - (436 / 2);            
            window.open(url, 'sharer', 'toolbar=0,status=0,width=626,height=436,modal=yes,alwaysRaised=yes, top=' + top + ', left=' + left);
        },

        OpenFacebook: function (url) {
            var left = (screen.width / 2) - (1024 / 2);
            var top = (screen.height / 2) - (436 / 2); 
            window.open(url, 'sharer', 'toolbar=0,status=0,width=1024,height=436,modal=yes,alwaysRaised=yes, top=' + top + ', left=' + left)
        }
    };
} ();