function open_win(pagina,nomepopup,scrollbars,width,height)
	{
	  larghezza=screen.width;
	  altezza=screen.height;
	  spazio_oriz=(larghezza-width)/2;
	  spazio_vert=(altezza-height)/2;
	  parametri = "resizable=no,scrollbars="+scrollbars+",width="+width+",height="+height+",left="+spazio_oriz+",top="+spazio_vert;
	  window.open(pagina, nomepopup ,parametri);
	}
	
	             
	toc01on = new Image();          
    toc01on.src = "images/bus_foto_home_on.gif";
    toc02on = new Image();          
    toc02on.src = "images/area_bus_on.gif";
	toc03on = new Image();          
    toc03on.src = "images/family_foto_home_on.gif";
    toc04on = new Image();          
    toc04on.src = "images/area_family_on.gif";

     toc01off = new Image();          
     toc01off.src = "images/bus_foto_home_off.gif";
     toc02off = new Image();          
     toc02off.src = "images/area_bus_off.gif";
     toc03off = new Image();          
     toc03off.src = "images/family_foto_home_off.gif";
     toc04off = new Image();          
     toc04off.src = "images/area_family_off.gif";
             
function img_act(imgName)
	{
		imgOn = eval(imgName + "on.src");
		document [imgName].src = imgOn;
	}
function img_inact(imgName)
	{
		imgOff = eval(imgName + "off.src");
		document [imgName].src = imgOff;
	}