Make sure that the menu you want on top has a higher z-index than the menu you want it to cover and that each of the menus are either position:relative or position:absolute. One can be relative and the other absolute or both the same. Default z-index is 0. All this is done in the style for the menus or their containing divisions, example (as inline style):
Code:
<div style="position:relative;z-index:100">
for the dominant menu and:
Code:
<div style="position:relative">
for the one you want to be covered.
Either or both of your menus may have position and/or z-index already defined for them in their code, an onpage stylesheet, inline style, or an external stylesheet. Best to check first.
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