if(document.getElementById)
{
	document.write('\n<style type="text/css">\n')
	document.write('.sottomenu_item {\ndisplay: none;\n}\n')
	document.write('</style>\n')
}
function SwitchMenu(obj){
	if(document.getElementById)
	{
		var el=document.getElementById(obj);
		var ar=document.getElementById("principale").getElementsByTagName("div");
		if(el.style.display!="block")
		{
			for(var i=0;i<ar.length;i++)
			{
				if(ar[i].className=="sottomenu_item")
					ar[i].style.display="none";
			}
			el.style.display="block";
		}
		else{el.style.display="none";}
	}
}