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<html>
  <head>
    <script type="text/javascript" src="js/jquery-1.3.2.js"></script>
    <script type="text/javascript">
        $(document).ready(function(){
            var $curr = $("#start");
            $curr.css("color", "#f99");
            $("button").click(function () {
                 $curr = $curr.prev();
                 $("div").css("color", "");
                 $curr.css("color", "#f99");
            });
        });
    </script>
  </head>
  <body>
    <body>
          <div>asdf</div>
          <div>asdf</div>
          <div>asdf</div>
          <div>asdf</div>
          <div>asdf</div>
          <div>asdf</div>
          <div id="start">asdf</div>
          <div>asdf</div>
          <button>Go to Prev</button>
  </body>
</html>

   
    
    
    
  








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1.Get previous one
2.Find the very previous sibling of each paragraph that has a class "selected".