Mouseover effect needs to be above other layers

i have a button that is under some other layers (and needs to stay below those layers) and when a user mouses over the button it drops an info box own from the top with info on the product they are hovered over. the problem is that when it drops, it goes behind the objects on the layers that are above it (they need to be above it too) is there a way i can make a button on the bottom layer drop down an object but above everything?