$(document).ready(function(){
 //  setInterval( "Refresh_online()", 30000 );
});

function Refresh_online() {  
  
  var page_url = "http://www.preciocubano/get_online.php";
  $.ajax({
           async:true,
           type: "POST",
           dataType: "html",
           contentType: "application/x-www-form-urlencoded",
           url:page_url,
           data:"",
           beforeSend:inicioEnvio,
           success:llegadaDatos,
           timeout:4000,
           error:problemas
         }); 
  return false;
}



function llegadaDatos(data) { 
  if (data.length > 2) {
      var myData = JSON.parse(data)[0];
   
      var x;
      x=$("#members_online");
      x.html(myData.data);
   
  }
}