Nothing is happening at all? Do you mean you just aren't getting the results in the placeholder div? Or do you mean the request isn't being sent? If you are using Firefox (and you should be) then you should install the Firebug extension so that you can more easily debug these kinds of issues. You will be able to view the request and the response sent/received for all the ajax requests.
And, why are you using an absolute URL? You should be specifying /StripesWebApp/createStockStep3ManualEntry.htm -- this was template that I was using from an example of a tutorial page. All I did was insert my pages to display.
When I turned on firebug within firefox, I saw nothing being displayed at all when I clicked the GetHTML button.