Not to take anything away from the other StageManager thread/class, but I made my own as I wanted a little bit more to be controlled by the class. To save face, just read about it here:
http://blog.reintroducing.com/index.php/01/07/2007/430
Here are more links:
View Example
View Documentation
Download Class & Example Files
UPDATE 7/2/07: I updated the files to reflect the x and y offsets that gvozden suggested. Thanks for the idea!