Need help with the tabs

[font=Times New Roman][size=3]Hi,[/size][/font]

[font=Times New Roman][size=3]In one of the sites I have seen a functionality which I want to use it in my project. I have absolutely no clue how to achieve the tabs kind of effect. In the screenshot you can see that in “Character Library” option, character tab is highlighted. When you click on the audio tab it comes in front and gets highlighted and character tab goes in the background. It would be really very helpful if someone can guide me how to do this. I use flash mx.[/size][/font]