<?php

function designartikel_tool_menu() {

  $items['node/%/copy'] = array(
    'title' => 'copy',
    'page callback' => 'node_copy',
    'access callback' => 'user_access',
    'access arguments' => array('administer site configuration'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 1,
  );
 return $items;
}

function node_copy() {
  $newnode = new StdClass();
  $node = node_load(arg(1));
  $newnode = $node;
  $newnode -> nid = null;
  $newnode = node_submit($newnode);
   if ($newnode->validated) {
      node_save($newnode);
   }
  drupal_goto("node/$newnode->nid/edit");
}