[BRotondi]

O.K. it works now: www.Hilfe2.ch > Hover over "Projekte"

What you need:
- popupmenu1 prevents java-script to add the pulldown-code
- popupbody1 is only visible during hover

This way you can hover for the pulldown and also click for a direct link.

additional.css

/* Pulldown-Menutabs */
li.popupmenu1:hover ul li {
display: block;
}
.popupbody1 li {
float: none;
display: none;
text-align: left;
z-index:99;
}
.popupmenu1 {
position: relative;
}
ul.popupbody1 li:first-child {
text-indent: 0px;
}
.navtabs li.popupmenu1 a.navtab, .popupbody1 li {
    font-weight: normal;
}
.navtabs ul.popupbody1 {
    width: auto;
}

plug-in on hook parse_templates
(use your own code)

$template_hook['navtab_middle'] .= '
<li class="popupmenu1" >
    <a href="threads/457" class="popupctrl navtab" title="Projekte, Ideen, Recherchen.">Projekte</a>
</li>

<li class="popupmenu1" >
    <a href="threads/28" class="popupctrl navtab" title="Artikel und Diskussionen, moderiertes Forum.">Artikel</a>
</li>

<li class="popupmenu1" >
    <a href="threads/756" class="popupctrl navtab">Hosting</a>
    <ul class="popupbody1">
        <li><a href="threads/697" title="Leimbach Kreis 2 - Unser gemeinsames Quartierportal - Mach mit!">Leimbach2</a></li>
    </ul>
</li>';

Change vbulletin-chrome.css (add the red code)

.navtabs li a.navtab, .popupbody1 li {

Perhaps my addon works: (TMS necessary!)