/*
 * AJAXRequest: An encapsulated AJAX request. To run, call
 * new AJAXRequest( method, url, async, process, data )
 *
 */

//==========================Create and send XMLHttpRequest =====================
function AJAXRequest( method, url, data, process, async, dosend) 
{
	//alert("test");
    // self = this; creates a pointer to the current function
    // the pointer will be used to create a "closure". A closure
    // allows a subordinate function to contain an object reference to the
    // calling function. We can't just use "this" because in our anonymous
    // function later, "this" will refer to the object that calls the function 
    // during runtime, not the AJAXRequest function that is declaring the function
    // clear as mud, right?
    // Java this ain't
    

    var self = this;

	this.status       = null;
	this.statusText   = null;
	this.responseText = null;
	this.responseXML  = null;
	//var AJAX

    // check the dom to see if this is IE or not
    if (window.XMLHttpRequest) 
	{
	// Not IE
        self.AJAX = new XMLHttpRequest();
    }
	else if (window.ActiveXObject) 
	{
	// Hello IE!
        // Instantiate the latest MS ActiveX Objects
        if (_ms_XMLHttpRequest_ActiveX)
		{
            self.AJAX = new ActiveXObject(_ms_XMLHttpRequest_ActiveX);
        } 
		else
		{
	    // loops through the various versions of XMLHTTP to ensure we're using the latest
			var versions = ["Msxml2.XMLHTTP.7.0", "Msxml2.XMLHTTP.6.0", "Msxml2.XMLHTTP.5.0", "Msxml2.XMLHTTP.4.0", "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP",
                        "Microsoft.XMLHTTP"];

            for (var i = 0; i < versions.length ; i++)
			{
                try 
				{
					// try to create the object
					// if it doesn't work, we'll try again
					// if it does work, we'll save a reference to the proper one to speed up future instantiations
                    self.AJAX = new ActiveXObject(versions[i]);

                    if (self.AJAX)
					{
                        _ms_XMLHttpRequest_ActiveX = versions[i];
                        break;
                    }
                }
                catch (objException) 
				{
                // trap; try next one
                } 
            }
        }
    }
    
    // if no callback process is specified, then assing a default which executes the code returned by the server
    if (typeof process == 'undefined' || process == null) 
   {
        process = executeReturn;
    }

    self.process = process;

    // create an anonymous function to log state changes
    self.AJAX.onreadystatechange = function( ) 
	{
        //logger("AJAXRequest Handler: State =  " + self.AJAX.readyState);
        self.process(self.AJAX);
    }

    // if no method specified, then default to POST
    if (!method)
	{
        method = "POST";
    }

    method = method.toUpperCase();

    if (typeof async == 'undefined' || async == null) 
	{
        async = true;
    }

  // logger("----------------------------------------------------------------------",true);
  // logger("AJAX Request: " + ((async) ? "Async" : "Sync") + " " + method + ": URL: " + url + ", Data: " + data);
	
	//alert(method);
	//alert(url);
	//alert(async);
	//alert(self.process);
	
    
	self.AJAX.open(method, url, async);

    if (method == "POST") 
	{
        self.AJAX.setRequestHeader("Connection", "close");
        self.AJAX.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
        self.AJAX.setRequestHeader("Method", "POST " + url + "HTTP/1.1");
    }

    // if dosend is true or undefined, send the request
    // only fails is dosend is false
    // you'd do this to set special request headers
    if ( dosend || typeof dosend == 'undefined' )
	{
	    if ( !data ) data=""; 
	    self.AJAX.send(data);
    }
    return self.AJAX;
}