function addSingleMarker(lon, lat, popup, usr_id){
    clearMap(true, false, true);// marker, layer, popup
    checkMap(lon, lat, 18); // !defined map (lon, lat, zoom)
    icons = [];
    icons[0] = ['http://www.city24.ge/img/icons/'+usr_id+'.png','27','27','0.5','1'];
    addMarker(this.layer_markers, parseFloat(lon), parseFloat(lat), popup, true, 0, usr_id);
    zoomManipulation(this.layer_markers, 9);
}