How to display cities once a state is selected with javascript

[juganta]

i have one registration form in that registration state and city dropdownlists are there.

when select the state(dropdownl ist) then the related cities will be displayed in city(dropdownli st) how can we done this through javascript. please give me urgent

[gits]

so as i understand that - you already have the data at the client and you want to filter the values according to a selection?