//mostra nascondi blocco div
function displaySiNo(obj,im)
{
	var elemIn  = document.getElementById(obj);
	var elemImg = document.getElementById(im);
	elemIn.style.display=(elemIn.style.display=='block')?"none":"block";
	elemImg.src=(elemIn.style.display=='block')?"/images/site/open-menu.gif":"/images/site/closed-menu.gif";
}