subcar = new Array();
function changelocation(locationid){
  document.postart.city_two.length = 0;
  document.postart.city_two.options[0] = new Option('Ñ¡Ôñ³ÇÊÐ','');
  var locationid=locationid;
  var i;
  for (i=0;i <=-1; i++){
    if (subcar[i][0] == locationid){
      document.postart.city_two.options[document.postart.city_two.length] = new Option(subcar[i][1], subcar[i][1]);}
    }}