Refreshing a single portlet rather than the whole portal page

Ok, here's my situation.
I have two pdk portlets on my portal that communicate through page parameters. Portlet A has a bunch of search fields, a customer drop-down list, parts drop-down list, division, etc. Portlet B takes those parameters, queries the database, and displays the results. I would like to be able to refresh portlet B without reloading the whole portal page.
I have onchange events on all of my drop-downs that will do a javascript post back to portal, which will in turn set my page parameters, and I see there is a 'refreshPortlet' function in a javascript file that portal provides that will refresh a single portlet based on a portletReferenceId. It is normally called when a refresh button is clicked in the portlet header, but I don't see any reason I can't call it after my javascript post, that is, if I had the portletReferenceId for the other portlet. I thought about making a hidden html table on the page that, I could fill with the portlet names and ids for each portlet as they load, that way I could reference that list from any portlet. The problem is I can't figure out where the ids are coming from. Based on the code behind the button, the function is looking for something like this 646_701285_646_1_701271, but the closest thing I can come up with is this 676114_POSTCONTENTPORTLET_467414915 which I got from PortletRenderRequest.getPortletInstance().getInstanceName(). As you can see, it's not even close. Does anyone know where the correct id could be coming from? It's got to be available to me somewhere, doesn't it?
The only other option I can think of to accomplish my goal is to use straight up ajax to display portlet B, but that kind of defeats the purpose of portal doesn't it?
Any help would be greatly appreciated.
Thanks,
Doug

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