prefered window position

My company has a web application that uses lots of windows. My boss forces us to set all "y" window positions to "0" (top) instead of the default center. To me, it's a pain in the *** to manually return windows to the center of the browser. I'm pretty sure most users agree but don't complain because it's not a big enough deal to waste time on processing complaints. If anyone has statistical proof (or anything useful) it would be of much help to persuade him.