<a href="http://www.baidu.com" style="display: inline-block; width: 100%; height: 150px;">

   <div class="divcss" style="width:100px;height:100px;background-color:#ff6a00;"></div>

 </a>

<script type="text/javascript">

     $(".divcss").click(function () {

         alert();

         return false;

     });

 </script>