// Browser sniffer
ua   = navigator.userAgent.toLowerCase();
ie6  = (ua.indexOf("msie") && document.all && ua.indexOf("netscape") == -1);
nnf  = (ua.indexOf("netscape")  != -1 && ua.indexOf("gecko") != -1);
nni  = (ua.indexOf("netscape")  != -1 && ua.indexOf("msie") != -1);
nn6  = (ua.indexOf("netscape")  != -1);
gek  = (ua.indexOf("gecko")     != -1);
ff1  = (ua.indexOf("firefox")   != -1);
opr  = (ua.indexOf("opera")     != -1);
mac  = (ua.indexOf("mac")       != -1);
web  = (ua.indexOf("webtv")     != -1);
saf  = (ua.indexOf("safari")    != -1);
kon  = (ua.indexOf("konqueror") != -1);
nn4  = (document.layers);