[jQuery] clone of div

i have a parent div with 10 divs and other controls as childrens.. now
i've a button which is used to create another parentdiv with all
childrens. how can i insert the similar code on each click like

<div id=parentdiv>
<div id=child1>
<div id=child2>
......
<div id=child10>
</div>
-----the button click should insert the same thing

<input type=button id='btn'>
$("#btn").click(function(){

???.insertAfter($("parentdiv"));

});

how can i do that?
thanx