FlexMonkium is a free Selenium IDE plugin for FlexMonkey that is used in recording and playback to Selenium. With FlexMonkium, Flex recording and playback is seamlessly interleaved with native Selenium recording and playback so you can easily automate the testing of hybrid web applications that mix html and Javascript with Flex. In addition to creating and running Flex tests inside the Selenium IDE, you can export your hybrid testing scripts as JUnit 4 tests that run with Selenium-RC to easily enable automated testing and continuous integration.
For more info check http://www.gorillalogic.com/flexmonkium