How to change font style in Facebook Chat

How to do the following in FaceBook Chat : make text Bold , Italics , Underline.
The code to do all this is given below.


For making the text Bold:
type your words between * *(two stars ) will automatically turns into bold.
Example : You write
Welcome to *S2P Tech*
will turns to
Welcome to S2P Tech


For underlined Text
type between _ _(two underscores) will automatically turns into underlined text
Example:
Welcome to _S2P Tech_
Turns to
Welcome to S2P Tech


For writing Bold+Underline:
Whatever you type between *_ _* will automatically turns into Bold+Underline
Example:
Welcome to *_www.s2ptech.blogspot.com_*
Turns to
Welcome to www.s2ptech.blogspot.com