This is actually the ASP forum, not
JS, but here's my idea.. on the onLoad event, you launch the new window, then set the focus on the parent window to bring it back to the front covering your new window while it resizes and adjusts it's location, then sets the focus back on the child window after the window alteration is complete.
Never tried it, but another idea might be to try to set the size of the window to be really small, do the window location adjustment, then the resize...