function changeOblast()
{
    var ajax = new sack();

    var stat = document.getElementById('stat');

    if (!stat) {
        return false;
    }

    stat = stat.value;

    var query = 'stat=' + stat;

    ajax.method = 'GET';
    ajax.requestFile = '/scripts/getOblasti.php';
    ajax.onCompletion = ajax.runResponse;
    ajax.runAJAX(query);
}

function changeStredisko()
{
    var ajax = new sack();

    var stat = document.getElementById('stat');
    var oblast = document.getElementById('oblast');

    if (!stat || !oblast) {
        return false;
    }

    stat = stat.value;
    oblast = oblast.value;

    var query = 'oblast=' + oblast + '&stat=' + stat;

    ajax.method = 'GET';
    ajax.requestFile = '/scripts/getStrediska.php';
    ajax.onCompletion = ajax.runResponse;
    ajax.runAJAX(query);
}