function TbsSheetSlide_DeleteDisplay($id_or_name, $ok, $delete) {

		if (is_null($ok)) $ok = true; // default value


		$ext = $this->ExtEquiv;

		$ok = (boolean) $ok;
		if (!is_array($id_or_name)) $id_or_name = array($id_or_name);

		foreach ($id_or_name as $item=>$action) {
			if (!is_bool($action)) {
				$item = $action;
				$action = $ok;
			}
			$item_ref = (is_string($item)) ? 'n:'.htmlspecialchars($item) : 'i:'.$item; // help to make the difference beetween id and name
			if ($delete) {
				if ($ok) {
					$this->OtbsSheetSlidesDelete[$item_ref] = $item;
				} else {
					unset($this->OtbsSheetSlidesVisible[$item_ref]);
				}
			} else {
				$this->OtbsSheetSlidesVisible[$item_ref] = $ok;
			}
		}

	}