var xmlHttp
//调用方法
function showCustomer()
{ 
var url="messsound.asp?sid=" + Math.random()
xmlHttp=GetXmlHttpObject(stateChanged)
xmlHttp.open("GET", url , true)
xmlHttp.send(null)
} 
//返回值
function stateChanged() 

{

if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
{ 
document.getElementById("pp").innerHTML="";

if(xmlHttp.responseText!=""){
	
	if(xmlHttp.responseText=="1"){
		
		document.getElementById("pp").innerHTML="<embed src='12.mp3' autostart=true loop=false hidden=true></embed>";
		
		}
		else
		{document.getElementById("pp").innerHTML="";}
}

}
}



//公用方法
function GetXmlHttpObject(handler)
{ 
var objXmlHttp=null

if (navigator.userAgent.indexOf("Opera")>=0)
{
alert("This example doesn't 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 
} 
} 
if (navigator.userAgent.indexOf("Mozilla")>=0)
{
objXmlHttp=new XMLHttpRequest()
objXmlHttp.onload=handler
objXmlHttp.onerror=handler
return objXmlHttp
}
} 
function MyShow()     

{     
//2秒自动刷新一次,2秒取得一次数据.     

timer = window.setInterval("showCustomer()",30000);     

}