function GetXmlHttpObject()
{
  var xmlHttp;
  try
    {
    // Firefox, Opera 8.0+, Safari
    return xmlHttp=new XMLHttpRequest();
    }
  catch (e)
    {
    // Internet Explorer
    try
      {
      return xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
    catch (e)
      {
      try
        {
        return xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
        }
      catch (e)
        {
        return null;
        }
      }
    }
}