function showMenu1()
	{
		$('menu11').style.display = 'block';
		$('menu22').style.display = 'none';
		
		$('menu1').innerHTML = '<img src="pic/menu/ferestre_over.gif" border="0px" alt="Ferestre">';
		
		$('home_menu').innerHTML = '<a href="index.php"><img src="pic/menu/home.gif" onmouseout="this.src=' + 'pic/menu/home.gif' + '" onmouseover="this.src=' + 'pic/menu/home_over.gif' + '" border="0px" alt="Home"></a>';
		
		$('menu2').innerHTML = '<a href="javascript: voide(0);" onclick="showMenu2()"><img src="pic/menu/usi.gif" onmouseout="this.src=' + 'pic/menu/usi.gif' + '" onmouseover="this.src=' + 'pic/menu/usi_over.gif' + '" border="0px" alt="Usi"></a>';
	}
	
	function showMenu2()
	{
		$('menu22').style.display = 'block';
		$('menu11').style.display = 'none';
		
		$('menu2').innerHTML = '<img src="pic/menu/usi_over.gif" border="0px" alt="Usi">';
		
		$('home_menu').innerHTML = '<a href="index.php"><img src="pic/menu/home.gif" onmouseout="this.src=' + 'pic/menu/home.gif' + '" onmouseover="this.src=' + 'pic/menu/home_over.gif' + '" border="0px" alt="Home"></a>';
		
		$('menu1').innerHTML = '<a href="javascript: voide(0);" onclick="showMenu1()"><img src="pic/menu/ferestre.gif" onmouseout="this.src=' + 'pic/menu/ferestre.gif' + '" onmouseover="this.src=' + 'pic/menu/ferestre_over.gif' + '" border="0px" alt="Ferestre"></a>';
	}