Html drop-down menu in Mozilla/Firefox

["Shaikh Quader" <ssquader@msn.com>]

Could anyone please tell me how to enable the drop-down menu support for 
Mozilla/Firefox?

For example, a drop-down menu generated from the following html is easily 
visible in Internet Explorer. But the drop-down  isn't visible when the web 
page is opened from Mozilla/Firefox.

<div Id="menu1" class="menu" >
 <div Id="menuItem1_3" class="menuItem"><a 
href="member.html">Members</a></div>
 <div Id="menuItem1_3" class="menuItem"><a 
href="constitution.html">Constitution</a></div>
  <div Id="menuItem1_3" class="menuItem"><a 
href="event.html">Event</a></div>
</div>


Thanks,
Shaikh