var requests = new Array();

if(typeof(XMLHttpRequest) == 'undefined')
var XMLHttpRequest = function()
{
	var request = null;
	try
	{
		request = new ActiveXObject('Msxml2.XMLHTTP');
	}
	catch(e)
	{
		try
		{
			request = new ActiveXObject('Microsoft.XMLHTTP');
		}
		catch(ee)
		{}
	}
	return request;
}

function ajax_stop()
{
	for(var i=0; i<requests.length; i++)
	{
		if(requests[i] != null)
			requests[i].abort();
	}
}

function ajax_create_request(context)
{
	for(var i=0; i<requests.length; i++)
	{
		if(requests[i].readyState == 4)
		{
			requests[i].abort();
			requests[i].context = context;
			return requests[i];
		}
	}

	var pos = requests.length;
	
	requests[pos] = Object();
	requests[pos].obj = new XMLHttpRequest();
	requests[pos].context = context;
	
	return requests[pos];
}

function ajax_request(url, data, callback, context)
{
	var request = ajax_create_request(context);
	var async = typeof(callback) == 'function';

	if(async) request.obj.onreadystatechange = function()
	{
		if(request.obj.readyState == 4)
			callback(new ajax_response(requ