web.config authorization in a folder

Hi. I was wondering how to make a special authorization like this situation:
1- There is a folder called "training_videos" which the authorization is set like this:
<location path="/training_videos"> <system.web> <authorization> <deny users="*"/> </authorization> </system.web></location> 
I want to set another authorization for a page inside this folder, I want to do something like this (but this won´t work) <location path="/training_videos/page.aspx"> 
  <system.web> 
    <authorization> 
      <allow roles="admin"/> 
    </authorization> 
  ...