Hi. Code not working because of async query and variable scope problem. I can't understand how to solve this. Change to $.ajax method with async:false - not an option. I know about closures, but how I can implement it here - don't know. I've seen all topics here about closures in js and jQuery async problems - but still nothing. Help, please. Here is the code:

var map = null;
var marker;
var cluster = null;

function refreshMap() 
{
    var markers = [];  
    var markerImage = new google.maps.MarkerImage('/images/image-1_32_t.png', new google.maps.Size(32, 32));

    $.get('/get_users.php',{},function(data){
        if(data.status == 'error')
            return false;

        var users = data.users; // here users.length = 1 - this is ok;  
        for(var i in users)
        {
            //here I have every values from users - ok
            var latLng = new google.maps.LatLng(users[i].lat, users[i].lng);
            var mark = new google.maps.Marker({
                position: latLng,
                icon: markerImage
         });

             markers.push(mark);
             alert(markers.length); // length 1
        }

    },'json');

    alert(markers.length); // length 0  
    //if I have alert() above - I get result

    cluster = new MarkerClusterer(map, markers, 
    {
        maxZoom: null,
        gridSize: null
    });
}

Thanks.