function caricare(){ 
if (document.layers){ 
document.layers.divTop18.visibility="show" //Netscape 4 
} 
if (document.all){ 
document.all.divTop18.style.visibility="visible" //Explorer 4 e 5 
} 
if (document.getElementById && !document.all){// Net 6 
document.getElementById('divTop18').style.visibility="visible" 
} 

}