function destroyTree() {
		global $destroyexecuted, $form, $db;

		$variations = createDBCArray("variations", "VARIATION_ID", "1");

		if (!$destroyexecuted) {
			$destroyexecuted = true;

			$delstart = value("del", "NUMERIC");
			$parentId = getDBCell("sitemap", "PARENT_ID", "MENU_ID = $delstart");
			$destroyArray = getPageTree($delstart);

			if (value("destroypages") == "0") {
				// geht nicht
				$meldung = "Please select also the check Destroy Tree. Only then the system will delete the tree.";

				$form->addToTopText($meldung);
			} else {
				if (value("destroycluster") == "0") {
					// nur pages löschen
					for ($i = 0; $i < count($destroyArray); $i++) {
						for ($j = 0; $j < count($variations); $j++) {
							expireSitepage($destroyArray[$i], 10, $variations[$j]);
						}

						$sql1 = "DELETE FROM sitepage WHERE SPID = $destroyArray[$i]";
						$menuid = getDBCell("sitepage", "MENU_ID", "SPID = " . $destroyArray[$i]);
						$deletequery = new query($db, $sql1);

						if ($menuid != "0" and $menuid != 0 and $menuid != "") {
							$sql2 = "DELETE FROM sitemap WHERE MENU_ID = $menuid";

							$sql3 = "DELETE FROM sitepage_names WHERE SPID = " . $destroyArray[$i];
							$sql4 = "DELETE FROM sitepage_owner WHERE SPID = " . $destroyArray[$i];

							$deletequery = new query($db, $sql3);
							$deletequery = new query($db, $sql4);
							$deletequery = new query($db, $sql2);
						}

						$deletequery->free();
					}
				} else {
					// pages und cluster
					for ($i = 0; $i < count($destroyArray); $i++) {
						for ($j = 0; $j < count($variations); $j++) {
							expireSitepage($destroyArray[$i], 10, $variations[$j]);
						}

						$clnid = getDBCell("sitepage", "CLNID", "SPID = $destroyArray[$i]");
						// only delete cluster if it is not used as channel article.
						if (!getDBCell("channel_articles", "CHID", "ARTICLE_ID = ".$clnid)) {
							$usage = 0;
							$usage += countRows("sitepage", "CLNID", "CLNID = $clnid AND DELETED=0");
							$usage += countRows("cluster_content", "FKID", "FKID = $clnid");
							$usage += countRows("cluster_template_items", "FDIK", "FKID = $clnid");
	
							if ($usage < 2) {
								$sql = "UPDATE cluster_node SET DELETED = 1 WHERE CLNID = $clnid";
	
								$query = new query($db, $sql);
							}
						}

						$sql1 = "DELETE FROM sitepage WHERE SPID = $destroyArray[$i]";
						$menuid = getDBCell("sitepage", "MENU_ID", "SPID = " . $destroyArray[$i]);
						$deletequery = new query($db, $sql1);

						if ($menuid != "0" and $menuid != 0 and $menuid != "") {
							$sql2 = "DELETE FROM sitemap WHERE MENU_ID = $menuid";

							$sql3 = "DELETE FROM sitepage_names WHERE SPID = " . $destroyArray[$i];
							$sql4 = "DELETE FROM sitepage_owner WHERE SPID = " . $destroyArray[$i];

							$deletequery = new query($db, $sql3);
							$deletequery = new query($db, $sql4);
							$deletequery = new query($db, $sql2);
						}

						$deletequery->free();
					
					}
				}
			}
			sortTableRows("sitemap", "MENU_ID", "POSITION", "PARENT_ID = $parentId");
		}
		
	}
	/**
	   * Expires a complete Menutree
	   *
	   * @param integer ID of the start-node from where to expire
	   * @param integer ID of the Variation you want to launch
	   */
	function expireMenuTree($menuId, $variation) {
		global $c;

		ini_set("max_execution_time", $c["timeout"]);
		$launchArray = getPageTree($menuId);

		for ($i = 0; $i < count($launchArray); $i++) {
			expireSitepage($launchArray[$i], 10, $variation);
		}
	}
						$mymenu = getDBCell("sitepage", "MENU_ID", "SPID=$spid");

						relaunchMenuTree($mymenu, $variation);
					} elseif ($action == $lang->get('launch_tree') && $aclf->checkAccessToFunction("B_LAUNCH_TREE")) {
						$mymenu = getDBCell("sitepage", "MENU_ID", "SPID=$spid");

						launchMenuTree($mymenu, $variation);
					} else if ($aclf->checkAccessToFunction("B_EXPIRE_LAUNCH")) {
						launchSitepage($spid, 10, $variation);
					}
				} else {
					$clusterPanel->addToTopText($lang->get("nosptitle"));
					$clusterPanel->setTopStyle("errorheader");
				}
			} else if ($action == $lang->get("sp_expire") && $aclf->checkAccessToFunction("B_EXPIRE_LAUNCH")) {
				expireSitepage($oid, 10, $variation);
			}
			else if ($action == $lang->get("rb_cache")) {
				// rebuildCache();	
				} else if ($action == $lang->get('exp_tree') && $aclf->checkAccessToFunction("B_EXPIRE_TREE")) {
				$mymenu = getDBCell("sitepage", "MENU_ID", "SPID=$spid");

				expireMenuTree($mymenu, $variation);
			} else if ($action == $lang->get('del_tree') && $aclf->checkAccessToFunction("B_DESTROY_TREE")) {
				$mymenu = getDBCell("sitepage", "MENU_ID", "SPID=$spid");
				header ("Location: destroy_tree.php?sid=$sid&del=$mymenu");
				exit;
			}
		}
		if ($clnid == "0" && ($type == 1 || ($type == 2 && ($action != "pproperties" && value("acstate") != "pproperties")))) {
			require_once $c["path"] . "modules/sitepages/logic_selectcluster.inc.php";