<!--
var visibleLayerID;
visibleLayerID = 0;
function SetLayerVisible (id)
{
//  document.getElementById('town0').style.visibility='hidden';
//  if (visibleLayerID > 0)
    document.getElementById('town'+visibleLayerID).style.visibility='hidden';
  document.getElementById('town'+id).style.visibility='visible';
  visibleLayerID = id;
}
//-->