Imagemap to select 2 points.

I'm writing some CGI applications.
I have a trouble which concernes with using ISMAP, but I think this must have happened to someone before. I'm trying to obtain from the user (client) two points (eg. source and
destination) from a single ISMAP .gif image. I'm working with apache1.2b6 over Solaris 2.3. First, I generate a HTML page asking the user to click over the first point. It makes the browser to send a GET query like this:       http://somewhere.net/coordinates.map?30,55
where coordinates.map is the name of the file where I have the coordinates of the relevant points of the image (!!over 110 points). When the server receives this, calls to the appropriate URL. This is another CGI to which I pass the point clicked. In the example it would be:
#Imagemap file coordinates.map
...
point /cgi-bin/choose-a-destination?src=Moscow 20,87
point /cgi-bin/choose-a-destination?src=London 30,55  # <--Closest point
point /cgi-bin/choose-a-destination?src=Madrid 70,21
...
which generates a HTML page that tells to the client that he choosed 'London' and asks for a second click, sending the second coordinates plus the src point. The question is : 1.- How can I generate such a page to call to another .map file, remembering the src field?.
(I tryed to generate /coordinates2.map?80,90&src=London but it doesn't work)
2.- I'm trying to make this whitn an stateless server. Can I do that?
Hope you can help me!!