v='w';

                        if (navigator.userAgent.indexOf("3.")==-1) {

                                if (navigator.platform.indexOf("Mac") >= 0) {

                                        if (navigator.userAgent.indexOf("3.")!=-1)v='m';

                                        if (navigator.userAgent.indexOf("4.")!=-1)v='m';

                                        if (navigator.userAgent.indexOf("5.")!=-1)v='w';

                                };

                        };

                        document.write('<link rel="stylesheet" type="text/css" href="styles_'+v+'.css">');