Replacement For Bscoutline Applet

Hi all,
I’m currently using bscoutline applet in my application for buliding a tree navigation.Now i want to replace applet with any other alternative(Like javascript or dhtml or ajax). i dont want applet.
Can anyone suggest me with alternative products available?
My database and tables is designed for bscoutline applet,so i’m looking for product that works similar to it.

i think my requirement is clear to you.

Thanks in advance.
Kumaresan