Hello cyril,
the naming of the div ids depends on the template that you are using.
I started a thread a while ago because I needed to get rid of all the cck divs.
There is a file templates/seb_one/fields/_markup.php
Read the instructions in that file to understand how to change the markup function to fit your needs.
You can use that markup.php for other templates, too.
And make a override in your template for /components/com_cck/views/list/tmpl/default.php.
In that file you can throw out a lot ov divs if you don't need them.