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<html>
 <head>
  <script type="text/javascript">
   function tree(treethis){
    if (treethis.alt == "+"){
     treethis.alt = "-";
     document.getElementById("bench").style.display="block";
    }else
    {
     treethis.alt = "+";
     document.getElementById("bench").style.display="none"; 
    }
   }
  </script>
 </head>
 <body>
  <a href="javascript:void(0)" style ="text-decoration:none;color:red" onclick="tree(this);" alt="+">aaaa</a>
  <span id="bench" style="display:none;margin-left:19px;">
   <?php
    $tree_bentch = array("aaa","bbb","ccc");
    for ($i=0;$i<count($tree_bentch);$i++){
     echo "<div>";
     echo "<a href=\"http://www.baidu.com\">$tree_bentch[$i]</a>";
     echo "</div>";
    }
   ?>
  </span>
 </body>
</html>


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