/** Funcao que ira trabalhar a opacidade */
	      var element = document.getElementById('ajax');
	      var duration = 1000;  /* 1000 millisecond fade = 1 sec */
	      var steps = 20;       /* number of opacity intervals   */
	      var delay = 2000;     /* 5 sec delay before fading out */
	      function setOpacity(level) {
	        element.style.opacity = level;
	        element.style.MozOpacity = level;
	        element.style.KhtmlOpacity = level;
	        element.style.filter = "alpha(opacity=" + (level * 100) + ");";
	      }
	      function fadeIn(){
	        element.innerHTML = xmlhttp.responseText
			for (i = 0; i <= 1; i += (1 / steps)) {
	          setTimeout("setOpacity(" + i + ")", i * duration);
	        }

	      }
	      function fadeOut() {
		  	var img_loading = "<div align='center'>Carregando conteudo...<br /><img src='imgs/loading.gif' /></div>";
			document.getElementById('ajax').innerHTML = img_loading;
		   	//setOpacity(0);
	        setTimeout("fadeIn()",1000);
   	      	setOpacity(0);
	      }
		/** Fim da funcao magica =) */