Use div or includes on ASP classic instead of a frameset

I currently use a framset for my website. (Code below)

<frameset rows="80,*,20" cols="*" framespacing="0" frameborder="no" border="0">
  <frame src="topframe.asp" name="top" scrolling="no" noresize="noresize" id="top" />
  <frame src="index.asp" name="Body" id="Body" />
<frame src="UntitledFrame-6"></frameset>

in this particular case a top frame and the main frame just below.

I want to get rid of the frames and include 'topframe.asp' at the top of the page on every page of my website. How can I do this ?

I am using classic ASP. I am able to do this using PHP but my whole system is Classic ASP at this point. Frames are very limiting so I want to try and use some sort of code to include the file at the top. If it changes the change should reflect system wide. As it does when I change the top frame.

So .. the bottom frame (index.asp)  should include 'topframe.asp' . Once I figure out how to do this in this specific page I can add the include code to all the pages in my system  that need to display the top frame.  :)