if (navigator.platform.indexOf('Mac') > -1) {





    //mac users





    if(navigator.appName.indexOf('Microsoft') > -1){





      //explorer





      document.write('<link href="./css/mac.css" rel="styleSheet" type="text/css">');











      }else{





      //netscape





      document.write('<link href="./css/mac.css" rel="styleSheet" type="text/css">');











  }











  } else {





    //windows or unix





    if (navigator.appName.indexOf('Microsoft') > -1) {





      //explorer





      document.write('<link href="./css/mac.css" rel="styleSheet" type="text/css">');











    } else {





      //netscape





      document.write('<link href="./css/win.css" rel="styleSheet" type="text/css">');











    }





  }