This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
That is a browser behavior based on the user's computer. How to fix it? Only thing I can suggest is you would have to remember where the user moved it tp, set a cookie, when that window loads again check a cookie value and move it there.