var xmlHttp
function CheckUserID(str)
{ 
var url="defaultmenu.asp?id=" + str
xmlHttp=GetXmlHttpObject(stateChanged)
xmlHttp.open("GET", url , false)

xmlHttp.send(null)
} 

function stateChanged() 
{

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

function GetXmlHttpObject(handler)
{ 
var objXmlHttp=null

if (navigator.userAgent.indexOf("Opera")>=0)
{
alert("無法在Opera查看分類") 
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
}
}