var xmlHttp

function showHint(str)
{
	if (str==0)
	{ 
	/*document.getElementById("").innerHTML="";*/
	return;
	}
	
	xmlHttp=GetXmlHttpObject()
	
	if (xmlHttp==null)
	{
	alert ("您的浏览器不支持AJAX！");
	return;
	}

  var url="pinpai2city.php";
  url=url+"?id="+str;
  url=url+"&sid="+Math.random();
  xmlHttp.onreadystatechange=stateChanged;
  xmlHttp.open("GET",url,true);
  xmlHttp.send(null);
} 

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