onfocusout behaviour

I'm using the following behaviour to hide two layers when the focus is lost on
another layer. It almost works but would be perfect if there was some kind of
"onhide" event instead of a "onfocusout" event. Is there something equivalent
to "onhide" that would work("onhide" meaning, when the layer is hidden it would
cause the other layers to show).


onfocusout="MM_showHideLayers('col34div','','show' );MM_showHideLayers('col30div'
,'','show')"