screen scraping a map?

Ok, I know this isn't the most moral thing to do but I want to screen scrap a map off of a web site. That is no big problem, but I want the page to generate the map first and then scrape the map.
here is the web page:
http://maps.mybc.com/index.jsp

now lets say that I want the location to be:
52 E 20th Ave, Vancouver, British Columbia

now the webpage will generate the link and then present the map (try and see). Now I want the map. Any ideas?

The page uses query string so you could analyse the query strings. Figure out how they work then use a webrequest to grab the response stream and parse it to include the map only.