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ListBox click problem!

ListBox click problem!

ListBox click problem!

(OP)
Hi everyone!
I had one problem with listbox.

I had create a page with three listbox in which i had data from database.
That works fine ,but now i want to put one more listbox in which will be date from database but only when someone click on second listbox.

For example

in second list box are the values:
Asia
Africa
Europa

i'd like when someone click on Asia in fourth listbox to have all
coutries from Asia like this
Japan
China
Iran

and then when he wants to submit those data to proceed to database
both Asia like one data ,and choosed coutry Japan for example.

How can i do this? If anyone have example or link for such a thing that will be fine?
I saw on this JSP forum ,but nothing similar exist.
Thanks

RE: ListBox click problem!

(OP)
Thanks for help and link
I will study this

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