var xmlHttp

function ShowCity(str,str1)
{ 
xmlHttp=GetXmlHttpObject123();
if (xmlHttp==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var a =str;
if (a == 0)
{	
//alert(a);
document.getElementById("city").disabled = true;
}
if (a!=0)
{
//alert(a);
document.getElementById("city").disabled = false;	
}
var url="ShowCity.asp?q1="+str;
//alert(a);
xmlHttp.onreadystatechange=CitystateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}

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

}

function GetXmlHttpObject123()
{
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;
}