function troca(liAtiva,divAtiva)
		{
			// trocar LIs
			var ulTeste = document.getElementById("menu");
			var arrLi = ulTeste.getElementsByTagName("li");
			
			for (var i=0; i < arrLi.length; i++)
			{
				arrLi[i].style.zIndex = "0";
				arrLi[i].className = "";
			}
		
			var li = document.getElementById(liAtiva);
			li.className = "ativo";
			li.style.zIndex = "999";
			

			// trocar divs
			var divContainer = document.getElementById("tabs");

			var arrDiv = divContainer.getElementsByTagName("div");
			
			for (var j=0; j < arrDiv.length; j++)
			{
				arrDiv[j].style.display = "none";
			}
			
			var ativa = document.getElementById(divAtiva);
			ativa.style.display = "block";
			
		}