function percorso(value){
 if (!document.layers&&!document.all)
 return
var percorso = "<a class=bianchi href=home.html target=body>Home</a> -> ";

url= percorso + boo + value;

if (document.layers){
document.layers.navi.document.write(url)
document.layers.navi.document.close()
}
else if (document.all)
navi.innerHTML=url
}