How to hide a text file behind a picture file(jpg)???

lemme explain u how????
for example .. u have a pic file
name- nirmal.jpg
u wanna hide a file called chat.doc (any text file,or any file)

right click the file->click the option add to filename.rar(u can use winzip also, the extension will be .zip thats all)
so after runnin it u will get a file called chat.rar..
nw u gonna hide this chat.rar inside nirmal.jpg file

lets start(very basic fn only)
go to->start->run
type cmd in run
u will get the command prompt,(using the commands cd all go to the directory in which both the files r located)
nw type the following
copy /b nirmal.jpg+chat.rar nirmalram.jpg
thats all...
(this nirmalram.jpg is the newly created file,when u click the file,the image in the nirmal.jpg will be displayed and ur text file is now hidden)
how to see it again??????
go to win rar->file->open(go to that directory,u will not find the file,change the options as all files,option will be below the file name text box)
nw ur file will be there,click it to view..
see nw u learned the basic method of steganography...Hide happily ... bye...