How to implement a "Processing, please wait..." page?

[Paul Spencer]

I need to implement a "Processing, please wait..." page that is 
displayed when a long query is running.  The backing bean currently has 
a method that returns "processing" or "done" to indicate the processing 
state of the query.  When "processing" is returned, the "Processing, 
please wait..." page is to be displayed for 1 second then then 
processing state will be checked again.

So how can I implement the above?

Paul Spencer