Given the possibility of novice computer users accessing this widget, we
need to handle the directions box with a bit of intelligence.

Proposed Enhancement:
Assumption: 
If no commas in the Directions Box, the user only typed in an address.
Assumption:
The starting address is in the same city/state as the selected location.

Given these two assumptions, I believe it is safe to append the city/state
of the selected location if it is obvious that the user did not enter a
full address, but only a street address.