Parameter refresh in a page

Hi,
I am new to this technology, please give your suggestion for the following scenario.
I am using apex 2.2. I designed a page with multi select and list parameters in a page. User selects the values from parameters and clicks on submit button to view a simple table format report in other page.
Parameters in this page are following hierarchy. For example, Continent->country->state. If user selects continent from parameter1 then parameter2 has to dispaly corresponding countries and all other parameters should remain unchanged. i do not want to reload the same page or refresh all other parameters , because i have some other hierarchies and performance is also an issue.
Please advice me how can i achive this.
Thanks in advance
Babu

You should update to the latest version of Apex (3.2). I don't think this kind of solution works in 2.2. See this example how your requirements can be done:
http://apex.oracle.com/pls/otn/f?p=31517:119
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
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