function launch()
            {
                var ventana = window.self; 
                ventana.opener = window.self;
                UserWidth = window.screen.width;
                //var H=(screen.availHeight-screen.height)/2;
                var H=(screen.height-230)/2;
                var W=(UserWidth-600)/2;
                window.open('wf_recoverPassword.aspx', 'Autenticación','top='+H+',left='+W+',height=230,width=600, status=no,toolbar=no, menubar=no,location=no,resizable=no,scrollbars=no');
            }