Using JavaScript and the event model? IE doesn’t support event.currentTarget, it will come up undefined if used. Instead use (for special case IE): event.srcElement.id;

The ExternalInterface has a multitude of uses.  One example is developing C++ applications with a Flex UI. In this example, I’ll show how to using ExternalInterface using ActionScript and JavaScript. We’ll send text back and forth as well as set color to shapes.Check out the example and the source. Note:  I started using the Flex C++ Bridge  using Visual C++ Express, [...]