function show_google_map(location, year)
{
 var zoom;
 doc = window.document;
 if(location == 0 || location == '' || location == null)
 {
  location = 0;
 }
 if(year == '' || year == null)
 {
  year = 0;
 }
 doc.getElementById('iframe_map').src='modules/events/google_map.php?loc=' + location + '&year=' + year;
 doc.getElementById('google_map').style.display='block';
 doc.getElementById('google_map').focus();
}

function close_map()
{
 window.document.getElementById('google_map').style.display='none';
}