Javascript Error: Reference to undefined variable: No such variable 'XMLHttpRequest'

In Opera 7.23 I'm getting the following error on my Ajax code:

message: Reference to undefined variable: No such variable 'XMLHttpRequest'

My create XMLHttpRequest code:

function createRequestObject()
{
    var request_o; //declare the variable to hold the object.
    var browser = navigator.appName; //find the browser name
    if (browser == "Microsoft Internet Explorer")
       {
         /* Create the object using MSIE's method */
         request_o = new ActiveXObject("Microsoft.XMLHTTP");
       }
    else
       {
         /* Create the object using other browser's method */
         request_o = new XMLHttpRequest();
       }
    return request_o; //return the object
}

var http = createRequestObject();

Can anyone explain why I'm getting this JS error?
rfreshAsked:
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HonorGodConnect With a Mentor Commented:
 var xmlHttp;

  //------------------------------------------------------------------
  // Name: createXMLHttpRequest()
  // Role: Create the XML Request Object used by the Ajax routines
  //------------------------------------------------------------------
  function createXMLHttpRequest() {
    if ( window.ActiveXObject ) {
      xmlHttp = new ActiveXObject( "Microsoft.XMLHTTP" );
    } else if ( window.XMLHttpRequest ) {
      xmlHttp = new XMLHttpRequest();
    }
  }
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HonorGodCommented:
Your if test is failing...

if (browser == "Microsoft Internet Explorer")

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HonorGodCommented:
Thanks for the 'A'
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