function HttpClient() { } // HTTPCLIENT CLASS
HttpClient.prototype = {
	// type GET,POST passed to open
	requestType:'GET',
	// when set to true, async calls are made
	isAsync:true,
	// where an XMLHttpRequest instance is stored
	xmlhttp:false,
	// what is called when a successful async call is made
	callback:false,
	// what is called when send is called on XMLHttpRequest
	// set your own function to onSend to have a custom loading
	// effect
	onSend:function()
	{
		//document.getElementById('HttpClientStatus').style.display = 'block';
	},
 
	// what is called when readyState 4 is reached, this is
	// called before your callback
	onload:function()
	{
		//document.getElementById('HttpClientStatus').style.display = 'none';
	},
 
	// what is called when an http error happens
	onError:function(error)
	{
		alert(error);
	},
 
	// method to initialize an xmlhttpclient
	init:function()
	{
		try
		{
			// Mozilla / Safari
			this.xmlhttp = new XMLHttpRequest();
		}
		catch (e)
		{
			// IE
			var XMLHTTP_IDS = new Array('MSXML2.XMLHTTP.5.0',
				 'MSXML2.XMLHTTP.4.0',
				 'MSXML2.XMLHTTP.3.0',
				 'MSXML2.XMLHTTP',
				 'Microsoft.XMLHTTP');
			var success = false;
			for (var i=0;i < XMLHTTP_IDS.length && !success; i++)
			{
				try
				{
					this.xmlhttp = new ActiveXObject
					(XMLHTTP_IDS[i]);
					success = true;
				}
				catch (e)
				{}
			}
			if (!success)
			{
				this.onError('Unable to create XMLHttpRequest.');
			}
		}
	},
	// method to make a page request
	// @param string url  The page to make the request to
	// @param string payload  What you're sending if this is a POST
	//                        request
	makeRequest: function(url,payload)
	{
		if (!this.xmlhttp)
		{
			this.init();
		}
		this.xmlhttp.open(this.requestType,url,this.isAsync);
 
		// set onreadystatechange here since it will be reset after a
		//completed call in Mozilla
		var self = this;
		this.xmlhttp.onreadystatechange = function()
		{
			self._readyStateChangeCallback();
		}
		if (this.requestType == "POST")
		{
			this.xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
			this.xmlhttp.setRequestHeader("Content-length", payload.length);
			this.xmlhttp.setRequestHeader("Connection", "close");
		}
 
		this.xmlhttp.send(payload);
 
		if (!this.isAsync)
		{
			return this.xmlhttp.responseXML;
		}
	},
 
	// internal method used to handle ready state changes
	_readyStateChangeCallback:function()
	{
		switch(this.xmlhttp.readyState)
		{
			case 2:
				this.onSend();
				break;
			case 4:
				this.onload();
				if (this.xmlhttp.status == 200)
				{
					this.callback(this.xmlhttp.responseXML);
				}
				else
				{
					this.onError('HTTP Error Making Request: ' + '[' + this.xmlhttp.status + ']' + ' ' + this.xmlhttp.statusText);
				}
				break;
		}
	}
}

function set_dynamic_globals()
{
	client.requestType = "GET";
 
	client.callback = function(XMLresult)
	{
 
		if (XMLresult.getElementsByTagName("status"))
		{
			http_status = XMLresult.getElementsByTagName("status")[0].childNodes[0].nodeValue;
 
		}else{
			http_status = "FAILED";			
			return;
		}
		if (http_status == "SUCCESS"){
			// bunch of code that reads the values from the XML doc
		}
	}
	client.makeRequest(url,null);
	return;
}

var client = new HttpClient();