ciao e grazie per la risposta,
allora nel templatedetails.xml ho creato la posizione menu,
ora pero' non so come inserire il codice corretto del div dentro la posizione user3.
qui sotto il mio codice:
<div id="art-page-background-gradient"></div>
<div id="art-page-background-glare">
<div id="art-page-background-glare-image"></div>
</div>
<div id="art-main">
<div class="art-Sheet">
<div class="art-Sheet-tl"></div>
<div class="art-Sheet-tr"></div>
<div class="art-Sheet-bl"></div>
<div class="art-Sheet-br"></div>
<div class="art-Sheet-tc"></div>
<div class="art-Sheet-bc"></div>
<div class="art-Sheet-cl"></div>
<div class="art-Sheet-cr"></div>
<div class="art-Sheet-cc"></div>
<div class="art-Sheet-body">
<div class="art-Header">
<div class="art-Header-png"></div>
<div class="art-Header-jpeg"></div>
</div>
<jdoc:include type="modules" name="user3" />
<jdoc:include type="modules" name="banner1" style="artstyle" artstyle="art-nostyle" />
<?php echo artxPositions($document, array('top1', 'top2', 'top3'), 'art-block'); ?>
<div class="art-contentLayout">
<?php if (artxCountModules($document, 'left')) : ?>
<div class="art-sidebar1"><?php echo artxModules($document, 'left', 'art-block'); ?>
</div>