function districtdropdown()
{
var xmlHttp;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    try
      {
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    catch (e)
      {
      alert("Your browser does not support AJAX!");
      return false;
      }
    }
  }
  xmlHttp.onreadystatechange=function()
    {
    if(xmlHttp.readyState==4)
      {
        document.register.districts.options.length=0;
        var beforesplit = xmlHttp.responseText;
        var secondsplit = beforesplit.split("|");
            for(i = 0;i < secondsplit[0];i++){
                var num = i + 1; 
                var agencyid = secondsplit[num].split("_");
                document.register.districts.options[i] = new Option(agencyid[1], agencyid[0]);
            }
        
      }
    }
  
  var district = document.getElementById('provinces').options[document.getElementById('provinces').selectedIndex].value;
  xmlHttp.open("GET","./districtdropdown.php?id=" + district,true);
  xmlHttp.send(null);
  
}