Initiating the dropdowns through css

[blueuniverse]

I want to display a drop down (i.e. the default vbulletin type) through one of my header links but these are displayed using html.

i.e. the raw html code is something like

<ul>
<li><a href="#">drop down link</a></li>
</ul>

Is it possible to initiate one of the standard vbulletin drop downs by altering this code and if so how?

Thanks,
Ed

[blueuniverse]

Any ideas?