ID Switch

ID Switch

Simple project. I would like to reorder these divs so that div1 becomes 3, 3 becomes 2 and 2 becomes 1 - however, the code will only execute once. Any ideas?
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>switchTop()</title>
<script type="text/javascript" src="jquery-tutorials/jquery.js">
</script>
<script type="text/javascript">
$(document).ready(function(){   
   var inner =  $("#contain1").html();
   var $contain1 = $("#contain1");
   var $contain2 = $("#contain2");
   var $contain3 = $("#contain3");
   $contain1.click(function(){
      $contain1.fadeOut('fast');
      $contain3.hide();
      $contain3.html(inner).fadeIn('fast');
      $contain2.attr("id", "contain1");
      $contain3.attr("id", "contain2");
   });
      
   
});
</script>
<style type="text/css">
#contain1 {
   width:100px;
   text-align: center;
   cursor:pointer;
   color:#FF0000;
}
#contain2 {
   width:100px;
   text-align: center;
   cursor:pointer;
   color:#009900;
}
</style>


</head>

<body>
<div id="contain1">
<span>
   Red
</span>
</div>

<div id="contain2">
<span>
   Green
</span>
</div>

<div id="contain3">
</div>

</body>
</html>