Difficulty in Popup Drop Down Menu

[Pandit_India]

Plz help .........Hi i m working on php . i m not using any database .

In a php page in which, when user select a value from a drop down menu , then it should jump to a new popup drop down menu.

for example. in a form when user select a country from a drop down menu , so a popup drop down menu appear with all the state of the selected country.

i think u all got it my problem, plz help me out.
i m not using any data base.

so your ans sholud be in java script, or in php or in html.

Thanking you,