Content Swapped Between Child And Parent Windows?

I have a form that submits parameters to Stripes action. The action builds a URL, fetches a PDF from that URL and returns the PDF to the browser. Stripes has a neat StreamResolution object that takes the URLConnection and MIME type and returns the object which I can simply return to the browser.I also have a requirement that the document should be opened in a new window.Unfortunately, sometimes PDF generation takes a while, so I'm required to pop up a "Please wait..." window that has to be taken down once the PDF loads.I cannot use the target="_blank" on the form, since it prevents me from hooking the javascript I need, so I use javascript to submit the form [URL]:

<form action="/..." onsubmit="viewReport('/.../foo.action?eventName=view+p=x')" ">
...
</form>

Here is the javascript that gets called

Quote:

var report;
var spinner;
function viewReport(url, report) {

[code]....

The PDF is getting fetched and displayed and the popup is taken down, but the PDF content is displayed in the original window, while the new window contains the calling page.