The best way to transition through mcs

I have a flash file that i’m working on that features a photo and then 4 buttons (mcs) over the top of it each on a separate layer. presently i have an onrollover command so that the button starts flashing when the suer rolls over it. there is then an action to go to a certain frame within the mc and play onpress. this makes a photo relative to the button fade in over the top of the original background photo. the same happens in reverse onrollout. make sense so far??

my problem is that the image that loads onclick, covers up the other buttons on layers in the root of the movie.

i need to know how to keep these visible when clicking a button and a new photo loading over the top.

any help would be great. i can email you an swf so you can see what i mean if that helps (too large to post).