browser = navigator.appName;
ie = "Microsoft Internet Explorer";
netscape = "Netscape";
version = navigator.appVersion;

function show(tab) {
        if ((browser == netscape) && (version.indexOf("5.") < 0)) {
                document.layers[tab].visibility = 'visible';
        }
        else if (browser == ie) {
                document.all[tab].style.visibility = 'visible';
        }
        else {
                document.getElementById(tab).style.visibility = 'visible';
        }
}
function hide(tab) {
        if ((browser == netscape) && (version.indexOf("5.") < 0)) {
                document.layers[tab].visibility = 'hidden';
        }
        else if (browser == ie) {
                document.all[tab].style.visibility = 'hidden';
        }
        else {
                document.getElementById(tab).style.visibility = 'hidden';
        }
}
function display(tab) {
        for (var i = 0; i < tabs.length; i++) {
                if (tabs[i] == tab) {
                        show(tabs[i]);
                        show(datas[i]);
                }
                else {
                        hide(tabs[i]);
                        hide(datas[i]);
                }
        }
}