var useragent = navigator.userAgent;
var bName = (useragent.indexOf('Opera') > -1) ? 'Opera' : navigator.appName;
var pos = useragent.indexOf('MSIE');
if (pos > -1) {
bVer = useragent.substring(pos + 5);
var pos = bVer.indexOf(';');
var bVer = bVer.substring(0,pos);
}
var pos = useragent.indexOf('Opera');
if (pos > -1)	{
bVer = useragent.substring(pos + 6);
var pos = bVer.indexOf(' ');
var bVer = bVer.substring(0, pos);
}
if (bName == "Netscape") {
var bVer = useragent.substring(8);
var pos = bVer.indexOf(' ');
var bVer = bVer.substring(0, pos);
}
if (bName == "Netscape" && parseInt(navigator.appVersion) >= 5) {
var pos = useragent.lastIndexOf('/');
var bVer = useragent.substring(pos + 1);
}

if (bVer < 4){
document.write("<table width='100%' border='0' cellspacing='0' cellpadding='0'>");
document.write("<tr>");
document.write("<td bgcolor='#FF9900'><div align='center'><font color='#FFFFFF' size='2' face='Arial, Helvetica, sans-serif'><b>Achtung!</b> Ihr Browser scheint älter zu sein als Version 4.<br>Dadurch kann es zu ungereimtheiten in der Darstellung und/oder der Navigation kommen.</font></div></td>");
document.write("</tr>");
document.write("</table>");
}