var ver = navigator.appVersion.charAt (0);
var ie = 0, nn = 0;
if (navigator.appName == "Netscape")  nn = 1;
if (navigator.appName == "Microsoft Internet Explorer") ie = 1;

function Message(s) {
    if (ie && ver >= 4) {
        infobox.innerHTML = s;
    }
    else if (nn && ver >= 4) {
        doc = document.infobox.document;
        doc.open();
        doc.write(s);
        doc.close();
    }
}