var xmlHttp

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

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

function stateChangedp() 
{ 
  //alert("not 4 state"+xmlHttp.readyState);
	if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
	{ 
		var ptdata=xmlHttp.responseText;
		document.getElementById("town_div").innerHTML=ptdata;
	}
}

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;
}