product add wishlist

<?php $wishlist = Mage::getModel('wishlist/item')->load($_product->getId(),'product_id');
      if($wishlist->getId())
          //product is added
      echo "Added! - Product is in the wishlist!";
      else
          //add product to wishlist
      echo "<a href='".$this->helper('wishlist')->getAddUrl($_product) ."'>Add This?</a>";
  ;?>

link :- http://stackoverflow.com/questions/6740696/check-whether-a-product-is-in-the-wishlist-or-not