var xmlHttp;
var str=document.forms[0].state.value;
      //This is for district


function statechenged(str)
{ 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="district.php";
url=url+"?state="+str;

xmlHttp.onreadystatechange=state;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);

}

function state() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("district").innerHTML=xmlHttp.responseText;
}
}


//this is for city

function DistrictChanged(str)
{ 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="city.php";
url=url+"?district="+str;

xmlHttp.onreadystatechange=district;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);

}


function district() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("city").innerHTML=xmlHttp.responseText;
}
}


//this is for Area

function CityChanged(str)
{ 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="area.php";
url=url+"?city="+str;

xmlHttp.onreadystatechange=city;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}

function city() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("area").innerHTML=xmlHttp.responseText;
}
}

//this is for Area

function AreaChanged(str)
{ 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="subarea.php";
url=url+"?area="+str;

xmlHttp.onreadystatechange=subarea;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}



function subarea() 
{ 
if (xmlHttp.readyState==4)
{ 
document.getElementById("subarea").innerHTML=xmlHttp.responseText;
}
}




function GetXmlHttpObject()
{
var xmlHttp=null;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
return xmlHttp;
}