var aV = navigator.appVersion.toLowerCase();

var isMsie45 = aV.indexOf("msie 4.5");
var isMsie = aV.indexOf("msie");
var isNn = navigator.appName.toLowerCase().indexOf("netscape");

var isCompVersion = parseFloat(navigator.appVersion);
var isGenVersion = parseInt(navigator.appVersion);
var isVersion = isCompVersion - isGenVersion;

var cssFile = "default.css";

cssFile = (aV.indexOf("win")!= -1)?cssFile = (isMsie != -1 && isVersion == 0 && document.all)?"winmac_ie_5.css":(isNn != -1)?(isGenVersion >= 5 && document.getElementById)?"winmac_nn_6.css":(isCompVersion >= 4.08)?"win_nn_4.08-mac_ie_4.5.css":cssFile:cssFile:(aV.indexOf("mac")!= -1)?cssFile = (isMsie45!= -1)?"win_nn_4.08-mac_ie_4.5.css":(isMsie != -1 && isVersion == 0 && document.all)?"winmac_ie_5.css":(isNn!= -1)?(isVersion == 0 && document.getElementById)?"winmac_nn_6.css":(isCompVersion <= 4.7)?"mac_nn_4.7-.css":"mac_nn_4.72.css":cssFile:cssFile;

//alert('<link rel="stylesheet" href="/css/' + cssFile + '" type="text/css" />');

document.writeln('<link rel="stylesheet" href="../css/' + cssFile + '" type="text/css" />');