loadMovie and web service

hey action script gurus,

in my flash movies i can do this with no trouble

loadMovie(“http://www.petdoors.com.au/staywell19.jpg”,destinationMovie);

and load a picture of that cute cat in a movie. But when i try to access a jpeg that is dynamically generated by the server based on a url, such as this one:

http://128.138.165.117/cgi-bin/mapserv?map=/usr/local/apache/htdocs/umn_mapserver/geoff_working/working.map&request=GetMap&version=1.1&layers=cities,roads

the picture never shows up inside my movie. This is a web map service that returns maps based on the information passed in the url . That link works just fine in a browser but it doesnt seem to work with a simple loadMovie. Let me add that the jpeg never actually exists as a file on the server, but only on the client. Any idea of how I could load that jpeg into flash?

figured it out. the output jpeg was progressive, so i turned that off.