var xmlHttp;
function showCity(str)
{


xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request");
 return;
 }
var url="ajax.php";
url=url+"?z="+str;
url=url+"&sid="+Math.random();

xmlHttp.onreadystatechange=stateChanged;

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

}

function stateChanged()
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 {
            document.getElementById("txtHint").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;
}

function GetXmlHttpObject1()
{
var xmlHttp1=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp1=new XMLHttpRequest();
 }
catch (e)
 {
 //Internet Explorer
 try
  {
  xmlHttp1=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp1=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp1;
}