It's easy to change cities. Just go to:
http://avantgo.accuweather.com/pda/setup.asp
and enter the info of your city there (ZipCode or Name)
then look into the new URL.
As an example, if I want the weather of SanDiego, the URL must be:
http://avantgo.accuweather.com/pda/l...?zipcode=78384