How to make Ubermenu & Revolution Slider work together??!

Hey,
I installed Ubermenu a while back to enable a megamenu which worked nicely.
I recently installed the Revolution Slider, however, when you hover over the menu bar and the megamenu appears, it sits BEHIND the Reveolution Slider instead of in front of it—so you can’t see the megamenu categories as the slider is hiding it!!!

Any experience, ideas, knowledge? I don’t want to get rid of either of them…!

Thanks