function hw_ret(){

		var objXML = null;

			switch(xmlhttp.readyState){
				case 0:	//Uninitated
				case 1:	//Loading
				case 2:	//Loaded
				case 3:	//Interactive
					break;
				case 4:	//Complete
					switch(xmlhttp.status){
						case 403:	//Forbidden
						case 404:	//Not found
						case 500:	//Error in server
							alert('Retorno:'+xmlhttp.status);
							break;
						case 200:	//Ok. 
							alert("E-mail enviado");
						}
					break;
				default:
					//do nothing
			}
	}