Maven version

Dear list,

I am web developer, trying to get started with Jahia. I would like to use Eclipse with Jahia.
Obviously, I found the document explaining How To use jahia in Eclipse, but cannot pass one of these steps.

After checking out the trunks of the directories,  I should change into  maven-jahiawar-plugin and run maven plugin:install
Unfortunately, this does not work for me. I tried with the last version of maven first, but found out (and I hope this is true), that jahia was using maven 1.
So I downloaded maven v. 1.0.2, but I cannot have it working neither.

I have been pondering on that for a couple of hours, and I guess that:

-          I don't have a correct version of maven,

-          I did not checked out the project correctly.

Could you please say me what version of maven you are using, and if I am supposed to have this in my maven-jahiawar-plugin after check-out:

Output of ls:
maven-jahiawar-plugin.jpx                 plugin.jelly                             project.properties               src
maven.xml                                              plugin.properties                project.xml                            xdocs

Please list, be kind, help me.
With my best regards,
Alban