function $(id)
        {
            return document.getElementById(id);
        }
        function login_show() {
            $('auth').style.display = "block";
            $('authdialog').style.left = '50%';
            $('loginfocusneeded').focus();
        }
        function login_hide() {
            $('authdialog').style.position = 'absolute';
            $('authdialog').style.left = '-2000px';
            $('auth').style.display = "none";
        }
        document.onkeypress = function(ev){
            ev = ev || event;
            if(ev.keyCode==27)
                login_hide();
        }
        function ieheight() {
            var bg = $('body').offsetHeight;
            $('bg').style.height = bg + 'px';
        }
        window.onload = ieheight;