// prevede un layer di ID blank completamente vuoto 

layerStyleRef="layer.style.";
layerRef="document.all";
lastlayer="blank";
islayeron="0";
styleSwitch=".style";


if (navigator.appName == "Netscape") {

 layerStyleRef="layer.";

 layerRef="document.layers";

 styleSwitch="";

 }else{

 layerStyleRef="layer.style.";

 layerRef="document.all";

 styleSwitch=".style";

 }



function hideLayer(layerName){
		lastlayer="blank";
// 		eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="hidden"'); 	
		document.getElementById(layerName).style.visibility= "hidden";
 		} 

function showLayer(layerName){

 		if (lastlayer == layerName) {
 			hideLayer(lastlayer);
 			return
 		}
 		hideLayer(lastlayer);
 		lastlayer=layerName;
// 		eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="visible"'); 
		document.getElementById(layerName).style.visibility= "visible"; 
	} 	
 		
function showLayerABS(layerName){

// 		eval(layerRef+'["'+layerName+'"]'+styleSwitch+'.visibility="visible"'); 
		document.getElementById(layerName).style.visibility= "visible";	
 		} 


function HideAllLAyer(){
	
	for (i=0; i=document.all.length-1; i++) {
		if (document.all(i).tags=="DIV") {
			document.all(i).style.visibility="hidden";
		}
	
	}
}