function getOSType()
{
var RetCode = "";
var uAgent = navigator.userAgent.toUpperCase();
if (uAgent.indexOf("MAC") >= 0) RetCode = "MacOS";
if (uAgent.indexOf("WIN") >= 0) RetCode = "Windows";
return RetCode;
}

function getBrowserName()
{
var aName = navigator.appName.toUpperCase();
var uName = navigator.userAgent.toUpperCase();
if (uName.indexOf("SAFARI") >= 0)  return "Safari";
if (uName.indexOf("OPERA") >= 0)  return "Opera";
if (aName.indexOf("NETSCAPE") >= 0)  return "Netscape";
if (aName.indexOf("MICROSOFT") >= 0) return "Explorer";
return "";
}

function getBrowserVersion()
{
var browser = getBrowserName();
var version = 0;
var s = 0;
var e = 0;
var appVer  = navigator.appVersion;
var uName  = navigator.userAgent.toUpperCase();
if (browser == "Safari")
{
version = eval(appVer.substring(0,3)) - 4;
}
if (browser == "Opera")
{
s = uName.indexOf("OPERA ",0) + 6;
e = uName.indexOf(" ",s);
version = eval(uName.substring(s,e));
}
if (browser == "Netscape")
{
n = eval(appVer.charAt(0));
if (n > 4)
{
version = eval(uName.split("/")[3].charAt(0));
}else{
s = appVer.indexOf(" ",0);
version = eval(appVer.substring(0,s));
}
}
if (browser == "Explorer")
{
appVer  = navigator.userAgent;
s = appVer.indexOf("MSIE ",0) + 5;
e = appVer.indexOf(";",s);
version = eval(appVer.substring(s,e));
}
return version;
}

function setCSS(theURL)
{
var os      = getOSType();
var browser = getBrowserName();
var version = getBrowserVersion();
var dirName = theURL;
if (os == "MacOS")   dirName += "css/mac/";
if (os == "Windows") dirName += "css/win/";
if (browser == "Netscape") dirName += "nn";
if (browser == "Explorer") dirName += "ie";
if (browser == "Safari") dirName += "sf";
if (browser == "Opera") dirName += "op";
if ((version >= 1) && (version < 2))  dirName += "1.css";
if ((version >= 2) && (version < 3))  dirName += "2.css";
if ((version >= 3) && (version < 4))  dirName += "3.css";
if ((version >= 4) && (version < 4.5))  dirName += "4.css";
if ((version >= 4.5) && (version < 5))  dirName += "4.5.css";
if ((version >= 5) && (version < 5.5))  dirName += "5.css";
if ((version >= 5.5) && (version < 6))  dirName += "5.5.css";
if ((version >= 6) && (version < 7))  dirName += "6.css";
if ((version >= 7) && (version < 8))  dirName += "7.css";
document.write("<link rel='stylesheet' type='text/css' href='"+dirName+"'>");
}