function create(form) {
  {
  var L =form.robotstxt;
    L.value = "";    
    if (form.allow.value != "") {
      L.value +="User-agent: *\nDisallow:" +
      form.allow.value + "\n";              
      return;
    }
    if (form.allow.value != " /") {
      L.value +="User-agent: *\n" +
      form.allow.value;
    }
    if (form.file1.value != "") {
      L.value +="Disallow: " +
      form.file1.value + "\n";
    }
    if (form.file2.value != "") {
      L.value +="Disallow: " +
      form.file2.value + "\n";
    }    
    if (form.file3.value != "") {
      L.value +="Disallow: " +
      form.file3.value + "\n";      
    }
}
}