function map_click(area) {
  clearMap();
  if(area.selectedIndex>0) highLight(document.getElementById(area.value));
}
function select(a) {
  clearMap();
  highLight(a);
  document.getElementById('area').value = a.id;
}
function clearMap() {
  area=document.getElementById('area');
  for (i=1;i<document.getElementById('area').length;i++) {
    if(document.getElementById(area.options[i].value).style.color != "") {
      document.getElementById(area.options[i].value).style.color="";
      document.getElementById(area.options[i].value).style.backgroundColor="";
    }
  }
}
function highLight(a) {
  a.style.color="#fff";
  a.style.backgroundColor="#000";
}