How do I get my Popupextender to center on the page.  It always comes up right justified and then when I click on the popup, it moves to the center of the page.  I have tried all of the position options in the css file and am out of options right now.  Please help.

That did not work.  It always moves to the center of the page when I click on the popup window.  I don't want the window to move, I want it to be in the center.  And with these changes to width and the alignment, the size changed when I clicked on it as well.  It is almost as if something isn't getting updated properly the first time around.

How do you make sure that the skin is using an XHTML doctype ?