Alternate instructions, which may be slightly easier.
1. Enter
http://www.mta.nyc.ny.us/nyct/maps/sub1a.gif in BlackBerry Browser
2. Click Trackwheel, select "Full Image" to download
3. Click Trackwheel, select "Save" to save to Pictures Album
4. Enter
http://www.mta.nyc.ny.us/nyct/maps/sub2a.gif in BlackBerry Browser
5. Repeat steps 2 and 3
Now both map graphics are in your BlackBerry Pictures Album.