Please help! - help with layers positions

hi guys.

well i have a problem here.

i am making an animation with images and when i make than an image grow to a diference size near others images, one of the images superpose the other…

so the problem is than one image is interfering with the other.

I think that the problem was with the layers or something, but when i changed the image TOP of one of the layers the other image do the same thing.

how can i fix that issue???

you can look the preview of the animation and the problem here:
http://www.ventura.com.do/arq.html

rollover the image #1 it is fine, the problem is when you rollover the images #2 and #3.