var agent = navigator.userAgent;
                        var appver = navigator.appVersion;
                        var nav = navigator.appName;
                        var plf = null;
                        var ver = null;
                        if(agent.indexOf('Mac') != -1){
                                   plf = "Mac";
                        }else if(agent.indexOf('Win') != -1){
                                plf = "Win";
                        }else{
                                plf = "other";
                        }
                        if(agent.indexOf('MSIE') == -1){
                                ver = appver.charAt(0);
                                if(nav == "Netscape"){
                                        nav = "NN";
                                }
                        }else{
                                ver = agent.charAt(agent.indexOf('MSIE') + 5);
                                nav = "MSIE";
                        }

                        if(nav == "NN" && ver == "2"){
                        
                        }else if(plf == "Mac"){
                                document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="css/mac.css" TITLE="Default CSS for Macintosh Browser">');
                                document.close();
                        }else if(plf == "Win"){
                                document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="css/win.css" TITLE="Default CSS for Windows Browser">');
                                document.close();
                        }else{
                                document.write('<LINK REL="stylesheet" TYPE="text/css" HREF="css/win.css" TITLE="Default CSS for Windows Browser">');
                                document.close();
                        }