var xmlHttp

function showHint(str)
{ 
	
if (str.length > 0)
{ 
var url= str

xmlHttp=GetXmlHttpObject(stateChanged)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
} 
else
{ 
document.getElementById("txtHint").innerHTML=""
} 
} 

function stateChanged() 
{ 
//alert(""+spanname)
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")//服务器处理完成后
{ 
   return document.getElementById("txtHint").innerHTML=xmlHttp.responseText 
}
else

{
  return document.getElementById("txtHint").innerHTML="Please wait ..."   //服务器处理中
}
} 


//创建xmlrequest对象！针对不同种浏览器
function GetXmlHttpObject(handler)
{ 
var objXmlHttp=null
if (navigator.userAgent.indexOf("Opera")>=0)
{
alert("This example doesnt work in Opera") 
return;
}
if (navigator.userAgent.indexOf("MSIE")>=0)
{ 
var strName="Msxml2.XMLHTTP"
if (navigator.appVersion.indexOf("MSIE 5.5")>=0)
{
strName="Microsoft.XMLHTTP"
}


try
{ 
objXmlHttp=new ActiveXObject(strName)
objXmlHttp.onreadystatechange=handler 
return objXmlHttp
} 
catch(e)
{ 
alert("Error. Scripting for ActiveX might be disabled") 
return 
} 
} 


//创建xmlrequest对象！针对不同种浏览器结束
if (navigator.userAgent.indexOf("Mozilla")>=0)
{
objXmlHttp=new XMLHttpRequest()
objXmlHttp.onload=handler
objXmlHttp.onerror=handler 
return objXmlHttp
}
}