function apri_div(whichLayer){
	var menu_1_titolo_close = document.getElementById(menu_1_titolo_close);
	menu_1_titolo_close.style.display = "block";
	if (document.getElementById)
	{
		var style2 = document.getElementById(whichLayer).style;
		style2.display =  "block";
	}
	else if (document.all)
	{
		var style2 = document.all[whichLayer].style;
		style2.display =  "block";
	}
	else if (document.layers)
	{
		var style2 = document.layers[whichLayer].style;
		style2.display =  "block";
	}
}
function chiudi_div(whichLayer){
	var menu_1_titolo_open = document.getElementById(menu_1_titolo_open);
	menu_1_titolo_open.style.display = "block";
	if (document.getElementById)
	{
		var style2 = document.getElementById(whichLayer).style;
		style2.display =  "none";
	}
	else if (document.all)
	{
		var style2 = document.all[whichLayer].style;
		style2.display =  "none";
	}
	else if (document.layers)
	{
		var style2 = document.layers[whichLayer].style;
		style2.display =  "none";
	}
	
}