var nn=document.layers?true:false;
var ie=document.all?true:false;
var NS6=navigator.userAgent.toLowerCase().indexOf("gecko")!=-1?true:false;
var tlayer=null,cx=null,cy=null;

// funzione per il cambio dei layer
function cambia(showobj,hideobj,hideobj1,hideobj2,hideobj3,hideobj4,hideobj5,hideobj6,hideobj7) {
	shownon(showobj)
	hidenon(hideobj)
	hidenon(hideobj1)
	hidenon(hideobj2)
	hidenon(hideobj3)
	hidenon(hideobj4)
	hidenon(hideobj5)
	hidenon(hideobj6)
	hidenon(hideobj7)
}

//layers da visualizzare all'onLoad del body
function defaultLayers(){
	shownon('surface0')
	shownon('surface1')
	shownon('surface2')
	shownon('surface3')
	shownon('surface4')
	shownon('surface5')
	shownon('surface6')
	shownon('surface7')
	shownon('surface8')
	shownon('img')
}

//funzioni posizionamento layers
function layerPositioning(){
}