Назар Мокринский

myMap.controls.add('zoomControl', {
    float: 'none',
    position: {
        right: 40,
        top: 5
   }
});

myMap.controls.add('zoomControl', {right: '40px', top: '5px'});

myPlacemark.balloon.open();

function init () {
    var placemarks = [];
    ..
    placemarks[id] = myPlacemark;
    window.open_balloon(id) {
        placemarks[id].balloon.open();
    }
}