Daily misery

I stumbled across a weird IE 7 bug while working on a map project.

#test{
z-index:1;
}
#test{
z-index:0;
}

gecko browsers -> z-index = 0
IE 7 -> z-index=1

I’d tried putting all kind of stronger selectors, even !important and still IE 7 won’t overwrite the precedent z-index value.