Interportlet Communication.....

Hi All,

I am devloping a portal project.

[b]
The design is as follows :[/b]

1). Thei is a desktop, which contains the Book  namely 
     'Main Book.'
2). 'Main Book' contains a page namely 'Main Page'.
3). 'Main Page' contains a page namely 'Naviagtion Page' 
     (on left side) and a book namely 'Content Book' (on right 
     side).
4). 'Navigation Page' contains a PageFlow portlet namely   
      'Navigation Portlet' which contains some links. 
      These links refer to the PageFlow portlets on the right   
      side in 'Content Page' as described in 5). below.
5). 'Content Book' consists of a Page namely 'Content  
     Page'. Content Page contains 5 PageFlow Portlets
     namely 'CPo1', 'CPo2', 'CPo3', 'CPo4', and 'CPo5'.


[b]I need to do folowing things :[/b]

1). Initially, i need to display only 'Navigation Portlet' on left 
     side and 'CPo1' portlet on right side.
     All other portlets should be invisible.
2). When a user clicks on any links on the 'Navigation  
     Portlet', corresponding portlet should get visible on the
     right side and portlet 'CPo1' should get invisible.

I am using : [u][b]BEA Weblogic Portal 9/10[/b][/u]