clone(), clear values?

clone(), clear values?

I have a div structure with input elements like this:
 
<div id="categories">
    <div class="elements">
        <input type="text" name="v1" class="myclass" />
        <input type="text" name="v2" class="myclass" />
        <input type="text" name="v3" class="myclass" />
    </div>
</div>
<a href="" id="add_newitem">Add New Item</a>
 
I clone the div 'elements' and put that back into the div 'categories' like so:
 
 
 $("#add_newitemr").click(function() {
  $('.elements').clone().appendTo('#categories');
 });

 
This works fine, except that it also clones the values that were entered in the textfields. How can i clear the values of the newly cloned textfields??