We are using a JS menu that used layers created by div tags. The problem was that this layer was hiding behind behind 'select' dropdowns in the page.
I googled around for a solution and found out 2 solutions:
- Hide the select boxes when the menu is clicked and unhide them when the menu rolls back.
- Use the zIndex property and create a transparent IFrame under the menu layer.
The following links were of great help to me:
BEA portal menu.