How can I implement Rich Textbox Editor in php?

I am developing an online Application form. I want to implement a Rich textbox editor on this page.

Can anybody tell me how to do this?
OR
Can anybody give me code?

htmlArea

tinyMCE is best. Try it http://sourceforge.net/projects/tinymce/

htmlArea ???

http://www.htmlarea.com/

Thanx to everybody!

I have done with it…

Which did you choose tinymce or htmlarea ?

I like htmlarea,

I chose Tiny.