Displaying a submenu based on choice in some other menu? [duplicate]

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Possible Duplicate:

Populating child dropdownlists in JSP/Servlet

In my JSP page, I have used one div that adds some rows dynamically. Inside this div, there are dropdowns to select country, state and city values. On the basis of country selected, its corresponding states and cities should be displayed.

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You need to check this space Populating Child Dropdown