/** This method is used to rename pictures
* Names of pictures aren't same as filename
* Names of pictures appear as title for pictures if thTitleShow is set to true
*/
public function renameItem()
{
$actualName = substr($_POST['arg1'], strlen($this->idPrefix));
$fName = MyFiles::cleanFileName($actualName);
$newName = MyFiles::cleanItemTitle($_POST['arg2']);
$this->imgsOrder[$fName] = $newName;
$this->updateOrder($this->imgsOrder);
}