EDIT: Poradzilem sobie i wszystko dziala good:
Poprawana funkcje
Kod
function edit_file(f_name, f_script) {

   req = mint.Request();
   req.AddParam("file_name_mod", document.getElementById(f_name).value);
   req.AddParam("script_file_mod", document.getElementById(f_script).value);
  
req.OnLoading = function() {
document.getElementById("edit").style.display = "none";
document.getElementById("loading").innerHTML = "<img src=\'./grafiki/administration/spinner.gif\'> Trwa zapisywanie pliku...";
}

req.OnLoaded = function() {
document.getElementById("edit").style.display = "block";
}

   req.OnSuccess = function() {
      document.getElementById("loading").innerHTML = "";
      $("info_edit").innerHTML = req.responseText;
   }
   req.Set("method", "POST");
   req.Send("./system/check.php");
}
              </script>

Do tego oczywiscie evalScripts = true; i wszystko hula smile.gif

tongue.gif