I am opening centred pop up windows with Flash for a gallery
so when you click on a thumbnail, it brings up the centred pop win.
Unfortunately, if the user opens a pop up window, they have
to close it in order to open another one. What I want to happen is
if the user has a pop up window already open and selects another
thumbnail from the gallery, the pop up window is replaced by the
new one, meaning the user won't have to close a pop win.