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<!DOCTYPE html>
<html>
<head>
<script class="jsbin" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
<!--[if IE]>
  <script src="http://html5shiv.googlecode.com/svn/trunk/html5.js"></script>
<![endif]-->
<style>
  article, aside, figure, footer, header, hgroup, 
  menu, nav, section { display: block; }
</style>
</head>
<body>
  <div id="first">
     <div id='second1'></div>
     <div id='second2'>
          <div id='third1'></div>
          <div id='third2'>
               <div id='fourth1'></div>
               <div id='fourth2'></div>
          </div>
          <div id='third3'></div>
     </div>
     <div id='second3'></div>
     <div id='second4'></div>
</div>
​
</body>
</html>
 
function recursion ( elem, arr )
{
   var id = $(elem).attr('id');
   if ( id )
   { 
     var children = arr[ id  ] = {};
     $(elem).children().each( function(){ recursion(this, children ) });
   }
}
​
var elements = {};
recursion ( $("#first"), elements );
console.log ( JSON.stringify( elements ) );
​
Output 300px

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