So there is no way to make that work on Firefox???!! that's a negative point for this browser
it's really weird that the exact same configuration of layers work on IE but not on FireFox. according to what you said, it shouldnt work on IE either, since there is a layer on top of the content as well but, as i see, IE sorts this out.
any other solutions??... rethink the site is something i really dont wanna do!!
thanks a lot anyway