I'm about to work through a book, "Flex on Java" and it's asked me to install maven 2+ i downloaded maven from the apache site. 
Added :

```
M2_HOME = C:\apache-maven-2.2.1

```

and 

```
M2 = %M2_HOME%\bin

```

to the environment vars according to the instructions at <http://maven.apache.org/download.html>
then it gets to number 6 which says 
"In the same dialog, update/create the Path environment variable in the user variables and prepend the value `%M2%` to add Maven available in the command line."

Which environment variable should i edit and add `%M2%` to?

After googling i found a post which says "append", not prepend to the value of `JAVA_HOME`
I've tried prepending and appending it to the java home var but when i try to do 
an mvn command from the command line it says its not recognised.

Never used maven before so this is my first set up. Can anyone see what i'm not doing right or what else i need to do to be able to use the mvn command, please and thank you.