// Mostra e Nascondi elementi del documento
<!--
function mostra(obj) 
{   if  (document.layers) 
    {   if  (document.layers[obj] != null) document.layers[obj].visibility = 'visible';
    }
    else 
    if  (document.all) document.all[obj].style.visibility = 'visible';
}
 
function nascondi(obj) 
{	if  (document.layers) 
   	{   if (document.layers[obj] != null) document.layers[obj].visibility = 'hidden';
   	}
   	else 
   	if  (document.all)
       	document.all[obj].style.visibility = 'hidden';	
}

function mnINT(obj)		//interruttore: se visibile nasconde e viceversa
{
    if  (document.layers) {   
		if  (document.layers[obj] != null) {
			switch (document.layers[obj].visibility) {	
				case 'hidden':
				document.layers[obj].visibility = 'visible';
				break
				case 'visible':
				document.layers[obj].visibility = 'hidden';
				break
			}
		}
    }
    else 
    if  (document.all)	{ 
		switch (document.all[obj].style.visibility) { 
			case 'hidden': 
			document.all[obj].style.visibility = 'visible';
			break
			case 'visible':
			document.all[obj].style.visibility = 'hidden';
			break
		}
	}
}
//-->