// gestione layer

//gestione browser differenti Netscape/Explorer
if (navigator.appName=="Netscape") { // if Netscape
   layerRef=".layers"
   styleRef=""
}
else { // if Internet Explorer
   layerRef=".all"
   styleRef=".style"
}

function hideall() {
	hidelayer("associazione")
}

function showlayer(layername) {
	hidelayer("associazione")
   //NS document.layers[layername].visibility='visible'
   //IE document.all[layername].style.visibility='visible'
   eval("document"+layerRef+"[layername]"+styleRef+".visibility='visible'")
}

function hidelayer(layername) {
   eval("document"+layerRef+"[layername]"+styleRef+".visibility='hidden'")
}