Calling a page without the portal wrap

Question

I have a portlet with a form in it.
The form:
<netui:form action="toggleFavourite" onSubmit="return toggleFavourite(this)">
If the user has JavaScript DISABLED, the form works like an ordinary form - the page submits itself.
If the user has JavaScript ENABLED, the "toggleFavourite()" function is called, which submits the form entirely in JavaScript by extracting the target of the form, and calling it in script. This means that the page doesn't have to be reloaded.
When using the non-JavaScript method, I obviously need the form to submit, and come back with my portal page, including the portlet I submitted from (i.e. exactly as it normally does in WebLogic portals).
Whe submitting using JavaScript, I don't need the response to include any of the header/footer/pages/other portlets - I just want to return the single page referenced by the Page Flow (i.e. the page specified in the Forward action).
Is there anything I can add/change in the URL that's submitted in JavaScript to specifically tell the portal server to ONLY return the content within the specific JSP referenced in the Forward action?
The reason I'm asking this, is that it's a lot slower pulling down the entire portal page, than it would be to just return that single portlet content.
I hope I've explained this clear enough, but feel free to ask questions.

Answer 1

Nearly there.
I can now generate a URL to the portlet, along with parameters to pass in. All that's left to do is trigger the action to make use of the parameters.
It's beginning to sound very much like a bodge job - like we're trying to do something that hasn't been catered for. I've actually managed to get something working now, using a different bodge. I want to call the current portlet, calling the action "toggleFavourite". I therefore now do this:
PortletPresentationContext portCtx = PortletPresentationContext.getPortletPresentationContext(request);
String paramName = portCtx.getInstanceLabel();
paramName += "_actionOverride";
String paramValue = portCtx.getPortletUri();
paramValue = paramValue.substring(0, paramValue.lastIndexOf("/")+1);
paramValue += "toggleFavourite";
StandalonePortletURL url = StandalonePortletURL.createStandalonePortletURL(request,response);
url.addParameter("_nfpb","true");
url.addParameter(paramName, paramValue);
String postbackURL = url.toString();
I then have a form elsewhere in the page, and use JavaScript to take the parameters from the form, and append them to the URL generated above.
It's working, but it's not pretty!
Sounds like 9.2 will be the only clean option.