235172 collapsible view

We are in need of a collapsible view script of a current report that is taking long to load. We need all the purchase orders first categorized by year then a subcategory sorted by customer. So for example when the page first loads it would show +2008 +2007 +2006 then if i opened 2008 it would show -2008 + Customer One + Customer Two etc... Then if i opened the customer it would open the details that currently show. Example of the code is [login to view URL] on the right hand side under Channels / Categories.