Sobi2 Dinamic Menu Joomla 1.5.

I need a dinamic field menu for cities… when i select state in the sobi2form input information appears dinamically cities for each one state …also need in the search module the same function when i select categories and state appears cities select field

Joomla 1.5.20
Component Sobi2

I have the txt file with states and cities.
States and cities U.S.A.