Avoid web page been embedded by others

The key is using window.top. The keyword 'top' is a property in window instance which returns you the very most top parent frame instance of current window. Code Sample:

   1:  <script type="text/javascript">

   2:  function a()

   3:  {

   4:      if (window != top)

   5:      {

   6:          top.location.href = window.location.href;

   7:      }

   8:  }

   9:   

  10:  window.onload = a;

  11:  </script>