XMLHttpRequest not accessible from function....

[nmullen]

For some reason my XMLHttpRequest object is not able to be accessed from one of my functions for whatever reason.

 

Here is my automate function which is called when a button is clicked:

 

function Automate()
{	
var url = "";
var index = 0;
var i;
var list = document.getElementById("lstKWs");

//Automate Clicked
progression = 1;

//Fills the keyword list
FillKWs();

//If no keywords are present
if (list[0] == null || list[0].text == "---Click to Populate---")
{
	alert("Please Enter Keywords");
	document.getElementById("txtKWs").focus();
	return false;
}

initializeArrays();

//Initializes the xmlHttp Object
getSingleXMLHttpObject();

while (!xmlHttp)
{
	alert("XML HTTP WASNT SET");
	getSingleXMLHttpObject();
}

//Opens phpCall
//Starts a chain of calling sequences
var url="_includes/phpCall.php";
//Calls the adjust pagerank in waiting for a readyState = 4
xmlHttp.onreadystatechange=AdjustPageRank;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}

 

near the end of the function it calls AdjustPageRank everytime there is a state change!  Here is my AdjustPageRank function which seems to fail to recognize the xmlHttp object.  I keep getting the error:

 

Error: xmlHttp has no properties

Source File: "..."  - I Deleted the file directory

Line: 573

 

function AdjustPageRank() 
{ 
var index;
var rank;

if (xmlHttp.readyState==4)
{ 

	rank = xmlHttp.responseText;

	//Depending on page rank update radio buttons
	if (rank >6.9)
		document.getElementById("Linking_PageRank_0").checked = true
	else if (rank > 3.9)
		document.getElementById("Linking_PageRank_1").checked = true
	else
		document.getElementById("Linking_PageRank_2").checked = true


	//Calling the getGooglePages and concatenating the length of the keywords
	url="_includes/getGooglePages.php?KWLength=" + KWs.length;

	//Puts the array of keywords onto the URL
	for (index = 0;index<KWs.length;index++)
		url += "&keyword" + index + "=" + KWs[index];

		var xmlHttp = getSingleXMLHttpObject();
		//When the state changes call the getPages
		xmlHttp.onreadystatechange = getGooglePages;
		xmlHttp.open("GET",url,true);
		xmlHttp.send(null);


}
}

 

Also here's my getSingleXMLHttpObject

 

function getSingleXMLHttpObject()
{
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");
    }
  }
}

Any ideas on why my adjustpagerank function is reading my xmlHttp as having no properties?