How do I layer AddThis and Flash?
Having overlay problems with Flash objects and the AddThis Menu? Flash objects on web pages often cause conflicts with other HTML elements; this is a common problem.
To ensure compatibility, be sure to set the "wmode" attribute to "transparent" in all your
<embed /> tags.
<embed wmode="transparent" ... />.
If you are using
<object /> tags instead (or in addition),
<param name="wmode" value="transparent" /> as child elements of all your objects.
To learn more about how AddThis and Flash can work together in general, check out this overview.