data director for web and MImap question.

I am using on NT4 server: - IUS 9.x (NT4) - drvisapi.dll (for IIS). On NT4 client: - Data Director for Web (NT4). I made the example application in Data Director User's Guide (Chef Gary's Gourmet Health Food). One of the AppPages is the /locations/locate.html. It shows a map of USA in which you can click on. The position of the click will be passed as parameter to the URL and this same AppPage will anticipate on these parameters showing names of the shops nearest that point. Problem: Although I can see the parameters passed with the URL, the AppPage does not see the "x_value" as an existing variable. So, I will never get the message of the nearest shop. Any one can help me with this?