Ajax call to XMLHttpRequest() returns object not supported error

I have an Ajax function which calls the attached code to return the XML HTTP object.

However I get an error "Object doesn't support this property or method" on the following line:

return new XMLHttpRequest();

This has worked on other websites but I have no idea why it is failing here.
function GetXmlHttpObject()
{
	if (window.XMLHttpRequest)
	  {
	  // code for IE7+, Firefox, Chrome, Opera, Safari
	  return new XMLHttpRequest();
	  }
	if (window.ActiveXObject)
	  {
	  // code for IE6, IE5
	  return new ActiveXObject("Microsoft.XMLHTTP");
	  }
	return null;
}

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mike99cAsked:
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Greg AlexanderLead DeveloperCommented:
Try this function
function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 //Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}

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mike99cAuthor Commented:
Thanks for this but I still get the same error on the same line.
leakim971PluritechnicianCommented:
What is your browser and which version?

The following work fine for me. Can test it without any modification? Thanks
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script language="javascript">
	function GetXmlHttpObject()
	{
		if (window.XMLHttpRequest)
		{
			alert("ok1");
			// code for IE7+, Firefox, Chrome, Opera, Safari
			return new XMLHttpRequest();
		}
		if(window.ActiveXObject)
		{
			alert("ok2");
			// code for IE6, IE5
			return new ActiveXObject("Microsoft.XMLHTTP");
		}
		alert("bad1");
		return null;
	}
	window.onload = GetXmlHttpObject;
</script>
</head>
<body>
</body>
</html>

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mike99cAuthor Commented:
I am using IE8 and I did manageto get your script to work and a variation that is closer to my script.

Perhaps my script is clashing with other script files.
leakim971PluritechnicianCommented:
For sure!

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