var NET2 = (navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 4);
    var invis = (NET2) ? 'hide' : 'hidden';
    var vis = (NET2) ? 'show' : 'visible';
    var im13 = (NET2) ? document.im13 : document.all.im13.style;
    var im23 = (NET2) ? document.im23 : document.all.im23.style;
    var im33 = (NET2) ? document.im33 : document.all.im33.style;
    var im43 = (NET2) ? document.im43 : document.all.im43.style;