browName = navigator.appName;
if ((browName =="Netscape") && (parseInt(navigator.appVersion) <=4)) {
    window.alert("Bugs in Netscape browser causes that\nthis site looks not properly.\nBest viewed with Internet Explorer,\nMozzila or Netscape 7.");
}
else if ((browName =="Netscape") && (parseInt(navigator.appVersion) >= 7)) {
    document.write("");
}
else {
    document.write("");
}