Web Development

<br />
//<br />
// Define a list of Microsoft XML HTTP ActiveX objevts.<br />
//<br />
var XMLHTTPREQUEST_MS_PROGIDS = new Array(<br />
  "Msxml2.XMLHTTP.7.0",<br />
  "Msxml2.XMLHTTP.6.0",<br />
  "Msxml2.XMLHTTP.5.0",<br />
  "Msxml2.XMLHTTP.4.0",<br />
  "MSXML2.XMLHTTP.3.0",<br />
  "MSXML2.XMLHTTP",<br />
  "Microsoft.XMLHTTP"<br />
);<br />
<br />
//<br />
// Define ready state constants.<br />
//<br />
var HTTPREQUEST_UNINITIALIZED = 0;<br />
var HTTPREQUEST_LOADING       = 1;<br />
var HTTPREQUEST_LOADED        = 2;<br />
var HTTPREQUEST_INTERACTIVE   = 3;<br />
var HTTPREQUEST_COMPLETED     = 4;<br />
var HTTPREQUEST_SUCCESS		= 200;<br />
<br />
//<br />
// Returns XMLHttpRequest object.<br />
//<br />
function getXMLHttpRequest(){<br />
  var httpRequest = null;<br />
<br />
  // Create the appropriate HttpRequest object for the browser.<br />
  if (window.XMLHttpRequest)<br />
    httpRequest = new window.XMLHttpRequest();<br />
  else if (window.ActiveXObject){<br />
    // Must be IE, find the right ActiveXObject.<br />
    var success = false;<br />
    for(var i = 0; i < XMLHTTPREQUEST_MS_PROGIDS.length; i++){<br />
      try{<br />
        httpRequest = new ActiveXObject(XMLHTTPREQUEST_MS_PROGIDS[i]);<br />
        success = true;<br />
      }  // try<br />
      catch(e){}<br />
    }  // for(var i = 0; i < XMLHTTPREQUEST_MS_PROGIDS.length && !success; i++)<br />
  }  // else if (window.ActiveXObject != null)<br />
<br />
  // Display an error if we couldn't create one.<br />
  if (httpRequest == null)<br />
    alert("Error in HttpRequest():\n\n"<br />
      + "Cannot create an XMLHttpRequest object.");<br />
<br />
  // Return it.<br />
  return httpRequest;<br />
}  // function getXMLHttpRequest()<br />