       showModalDialog("modal1", "Remove user from group", "Are you sure that you want to remove user <span class='text-accent'>" + email + 
            "</span> from the group <span class='text-accent'>" + groupIdentifier + "</span>? This action will take effect immediately.",
            function() {},
            function() {
                
                var loadingElement = document.getElementById("loading" + id);

                sendAjaxRequest({
                    "url": "/admin/groups/{{.groupI