/**
 * Ajax
 */ 
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
  }
}