Debian installation

[Manwe]

I'm using Debian Etch
I'm trying to follow the Debian Installation Instructions from the document in the Zone Minder Documentation area, but I don't understand what kind of modifications we need to do in the sources.list file.

It says:

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Step 2. Installing ZoneMinder
Login using your root account

Type vi /etc/apt/sources.list

Add the following lines (press ESC and i to insert) :
deb ftp://ftp.nerim.net/debian-marillat/ experimental main
deb ftp://ftp.nerim.net/debian-marillat/ sarge main
deb http://www.spic.net/zoneminder/debian/ ./
deb-src http://www.spic.net/zoneminder/debian/ ./

Copy the XS4ALL deb line and change stable into sarge (press ESC and x to delete)
(press ESC and yy to copy, ESC and o to add an new line and ESC p to past)

Copy the XS4ALL line again and change stable into etch
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What's the XS4ALL?
change stable into sarge? there's no stable string in the file...

Please help!
Thanks in advance.