function setOmer() {
    var daysLeft = getDaysLeftToCount();
    daysLeft=0;
    if (daysLeft > 0) {
        document.getElementById('divOmer').style.display = 'block';
        document.getElementById('spanDaysLeft').innerHTML = daysLeft;
    }
}

function getDaysLeftToCount() {
    var currDate = new Date();
    var endDate = new Date();
    endDate.setFullYear(2010, 4, 17);
    // The number of milliseconds in one day
    var ONE_DAY = 1000 * 60 * 60 * 24
    // Convert both dates to milliseconds
    var date1_ms = endDate.getTime()
    var date2_ms = currDate.getTime()
    var difference_ms = Math.abs(date1_ms - date2_ms)
    // Convert back to days and return
    return Math.round(difference_ms / ONE_DAY)
}