function expandIt(BlockName) {
			img = eval('document.img_'+BlockName);
			x=img.src;
			
			if (document.getElementById(BlockName).style.display == "block") {
				document.getElementById(BlockName).style.display = "none";
				 if (x.substring(x.length-6,x.length) == "dw.gif")  img.src = "immagini/menu_sx.gif";
				else   img.src = "immagini/menu_dw.gif"
			} else {
				document.getElementById(BlockName).style.display = "block";
				if (x.substring(x.length-6,x.length) == "sx.gif")  img.src = "immagini/menu_dw.gif";
				else  img.src = "immagini/menu_sx.gif";
			}
		}