function disableField(field) {
 if (document.all || document.getElementById) {
    field.disabled = true; 
  }
}

function enableField(field) {
  if (document.all || document.getElementById) {
    field.disabled = false;
  }
}

function updateSearchLocationFields() {
  if (document.searchEventsForm.searchRegionId.selectedIndex > 0) {
    document.searchEventsForm.searchStateId.selectedIndex = 0;
    disableField(document.searchEventsForm.searchStateId);
  }
  else if (document.searchEventsForm.searchStateId.selectedIndex > 0) {
    document.searchEventsForm.searchRegionId.selectedIndex = 0;
    disableField(document.searchEventsForm.searchRegionId);
  }
  else {
    enableField(document.searchEventsForm.searchRegionId);
    enableField(document.searchEventsForm.searchStateId);
  }
  //alert("region: " + document.searchEventsForm.searchRegionId.selectedIndex + ", state: " + document.searchEventsForm.searchStateId.selectedIndex);
}

function enableSearchLocationFields() {
  enableField(document.searchEventsForm.searchRegionId);
  enableField(document.searchEventsForm.searchStateId);
}