if (navigator.platform.indexOf('Mac') > -1) {
    //mac
    if (navigator.appName.indexOf('Microsoft') > -1) {
      //explorer
      document.write("<link type='text/css' rel='stylesheet' href='../css/text_ie.css'>");
    } else {
      //netscape
      document.write("<link type='text/css' rel='stylesheet' href='../css/text_ie.css'>");
    }
  } else {
    //windows or unix
    if (navigator.appName.indexOf('Microsoft') > -1) {
      //explorer
      document.write("<link type='text/css' rel='stylesheet' href='../css/text_ie.css'>");
      
    } else {
      //netscape
      document.write("<link type='text/css' rel='stylesheet' href='../css/text_nn.css'>");
    }
  }