How do I make sure only 1 child window opens?

Question

So... I've got a button on the Main window that opens up a child window. If you click on it multiple times, it opens up multiple windows. This is not a good thing for this app... SO... Is there an easy way to to the following:... When you click on the open button, it opens a new window. If the window is already open in another spot, it will either close that window and open a new one, or simply relocate the existing window and place it where it would open. Any siggestions???