[nikita.mmf]

function clearInputFile ( elem ) {
  var parent_ = elem.parentNode,
      input_ = document.createElement("input");
  input_.type = "file";
  input_.name = elem.name;
  elem.id && input_.id = elem.id;
  elem.className && input_.className = elem.className;
  parent_.insertBefore( input_, elem );
  parent_.removeChild( elem );
  return input_;
}