function HideMeetingInfo()
{
  var popupDiv = document.getElementById('popupDiv');
  popupDiv.style.display = "none";
}


function ShowMeetingInfo(oLink, year, month, day)
{
  var popupDiv = document.getElementById('popupDiv');
  var meetingInfoDiv = document.getElementById('meetingInfoDiv');

  new Ajax.Request('calendar.php?year='+year+'&month='+month+'&day='+day,
    {      
      method:'get',
      onSuccess: function(transport){
        var response = transport.responseText || "no response text";
        meetingInfoDiv.innerHTML  = response;
        popupDiv.style.display = "block";        
      },
      onFailure: function(){ alert('Something went wrong...') }
    });
}