Submit form to a popup window

Sometime, when submit a form, you wanna open a new popup window and show submit result there.

Here's the code that can do the work:

<form action="report.html"
where the form will be submitted to
target="report"
name of the popup window onsubmit="window.open('about:blank','report','width=300,height=200')">
open a new window that has the target window name and expected window size first.

It was tested in Firefox 3.0 Beta, IE 7, Opera