Order Tracking

I'm trying to make an order tracking system like FedEX with VBScript. I used simple JavaScript to write the client's interface to load up a html page by typing in their phone number (5555555.htm). Now I need to make the administration page. I can get the program to write a new page (5555555.htm) with the order status, but i'm not sure how to modify an existing page. Is there a way to scan the html for certain fields?

Or can anyone think of a better way of doing this? The user types in their phone number and loads a page that has been previously prepared about their order status.

hope this makes sense.
thanks, fred

just generate a new page that overwrites the previous

or

if one exists - just do nothing