They are rollovers that reveal layers by clicking # (1 – 2 … ). The layers are: reverse, indigo, target 1 - 2 …
Since this site is a two years old one and I have never had problems until two months ago, my question is: why the action, at present, works perfectly on Chrome and do not on Firefox and Safari?
More: in previsualization it is ok on all the browers; transferred, the action works once on Firefox end Safari and stops to work at first change of page.
I have not made errors (Chrome ok!), is the action which requires updates?