I have a apsx form (Form A), which on submiting does a time consuming task. So i want to open a new aspx window (Form B) in which I want do do that time consuming task and show progress to the user and while that task is being completed I want Form A to redirect to Form C.

I opened form B in a new javascript window and updated the progress through ajax but Form A doesn't let me redirect to Form C unless Form B's processing is Completed....