ajax error at firefox, it keep saying

httpRequest is not defined
[Break on this error] if(httpRequest.readyState == 4 || httpRequest.readyState=="complete"){

How can i solve this problem. any advise?

    Tough to say without a page link or at least seeing the JavaScript you are using.

      A shot in the dark but....

      Did you initialize the XMLHttpRequest or ActiveXObject correctly? I.e. do you have somewhere:

      if(window.XMLHttpRequest)
{
    httpRequest = new XMLHttpRequest();
}
else if (window.ActiveXObject)
{
    httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
}

        is it normal when ajax keep running..

        i encounter ajax error at firefox error console
        Error: [Exception... "Component returned failure code: 0x80040111 (NS_ERROR_NOT_AVAILABLE) [nsIXMLHttpRequest.status]" nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)" location: "JS frame :: http://www.domain.com/js/ajax.js :: handleResponse2 :: line 143" data: no]

        function getXmlHttpRequest()
{
	var httpRequest = null;
	try
	{
		httpRequest = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch (e)
	{
		try
		{
			httpRequest = new ActiveXObject("Microsoft.XMLHTTP");
		}
		catch (e)
		{
			httpRequest = null;
		}
	}
	if (!httpRequest && typeof XMLHttpRequest != "undefined")
	{
		httpRequest = new XMLHttpRequest();
	}
	return httpRequest;
}

// Make the XMLHttpRequest object 
var httpRequest=false;


// Make the XMLHttpRequest object 
var http=getXmlHttpRequest();

function sendRequest(str,) { 
   http.open('get','clicks.php?task=hear&id='+str); 
   http.onreadystatechange = handleResponse; 
   http.send(null); 
} 

function handleResponse() { 

   if(http.readyState == 4 && http.status == 200){ 

  // Text returned FROM the PHP script 
  var response = http.responseText; 
  if(response) { 
      document.getElementById("txtHint").innerHTML = response; 
      } 

   } 
}

          There are many theories to where that error comes from...

          One
          Another
          A Bug report for Mozilla
          And another

          Just google for NS_ERROR_NOT_AVAILABLE +nsIXMLHttpRequest.status and that will turn up a bunch of results for you.

          If you can't get this sorted, what you may think about doing is utilizing some of the premade AJAX classes like jQuery or Prototype

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