Quel part tu comprends pas?
step 1
in the Settings part of the admin panel, turn advanced mode on, and choose the theme 'sample'.
step 2
download the .js file from http://www.rosscairns.com/downloads/
step 3
put it into the folder on your website:
/ndzx-studio/site/js/
step 4
in the folder /ndzx-studio/site/sample/ edit the index.php file
step 5
in this file you should see something like:
<script type='text/javascript' src='<%baseurl%><%basename%>/site/js/cookie.js'></script>
beneath this add:
<script type='text/javascript' src='<%baseurl%><%basename%>/site/js/expandingMenus.js'></script>
step 6
find the bit that says:
$(document).ready(function() {
    setTimeout('move_up()', 1);
});
beneath the setTimeout line add expandingMenu(1); where the number is the menu you want to be collapsable (the 1st one being 0). so for example if you want the the 1st and 3rd menu to be collapseable it would look like this:
$(document).ready(function() {
    setTimeout('move_up()', 1);
    expandingMenu(0);
    expandingMenu(2);
});
step 7
save it
that should be it. any questions just ask...