Populating report region using values in another region

Hi,
I have a scnerio. Help on this would be greately appreciated.
Following is the explaination based on department/employy example
On a single page, i want to show a region which will display a list of departments and every value of department will have a link to the list of employees working in that department.
On clicking a department, i want a report region on the same page to populate with the list of employees in the department.
So, when page will be loaded first time, no department will be selected so a single message i.e. "Select a department" will be displayed on the region dedicated for departments and will be populated when user will click on a department.
I am able to create two regions. On the left region, i am able to display a list of departments. I can also create links for the department values but i don't know how on first load i just display a message on right region (Select a department) and then on clicking the department, loading the report on the right region.
Thanks in advance
Salman

Thanks for your help.
I am able to do it but initially when page loades, it returns error message because it executes the query when page is loaded first time. My actually scenario contains a database link (which is assigned dynamically to the query). SO on first page load, no database link was found because hidden field contains NULL so it displays error message that "failed to parse SQL query:ORA-01729: database link name expected". How to solve this?
Mean while i also need help to generate an interactive report on the basis of a dynamic query. I have used a PL/SQL block returing a query to build a report for non interactive reports and it works fine but i want to do same for an interactive report. Can you please also help me how to do this?
Thanks
Salman
Edited by: Salman Qureshi on Aug 25, 2009 7:05 AM

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