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 
} 
}