mac=(navigator.appVersion.indexOf("Mac")!=-1)?true:false;
ie=(navigator.appName.charAt(0) == "M")?true:false;
ns=(navigator.appName.charAt(0) == "N")?true:false;

if(mac){
        if(ie){
              fName = "css/my_album/book_01/macIE.css";
}
        else if(ns){
               fName = "css/my_album/book_01/macNS.css";
        }
        else{
              fName = "css/my_album/book_01/macIE.css";
        }
}
else{
    if(ie){
                   fName = "css/my_album/book_01/WinIE.css";
        }
        else if(ns){
                   fName = "css/my_album/book_01/winNS.css";
        }
        else{
              fName = "css/my_album/book_01/WinIE.css";
        }
}

if (fName != null){
       document.write("<link rel=stylesheet HREF='"+fName+"'TYPE=text/css>");
}