function _ajax(_async)
{
	this.async   = _async
	this.handler = null
}

_ajax.prototype.createhandler = function()
{
	try
	{
		this.handler = new XMLHttpRequest
		return this.handler.setRequestHeader ? true : false
	}
	catch(e)
	{
		try
		{
			this.handler = new ActiveXObject('Microsoft.XMLHTTP')
			return true
		}
		catch (e)
		{
			return false
		}
	}

	return false
}

_ajax.prototype.onreadystatechange = function(_func)
{
	if (this.handler == null)
	{
		if (!this.createhandler())
		{
			return false
		}		
	}

	this.handler.onreadystatechange = _func
	return true
}

_ajax.prototype.encode_datastream = function(_datastream)
{
	_datastream = _datastream.split('&')

	for (key in _datastream)
	{
		if (_datastream[key].match(/\=/))
		{
			bits = _datastream[key].split('=')

			_datastream[key] = bits[0] + '=' + encodeURIComponent(bits[1])
		}
	}

	return _datastream.join('&')
}

_ajax.prototype.send = function(_datastream, _type, _file)
{

	if (!this.handler.readyState && !this.handler.readyState < 4)
	{
		_datastream = this.encode_datastream(_datastream)
		this.handler.open(_type, _file + '?' + ((_type == 'GET')? _datastream : ''), this.async)
		this.handler.send(_datastream)
	}	
}




function myresponsefunction(){
document.getElementById('mypopup').innerHTML=AJAX.handler.responseText;

fireMyPopup2();
}

function myresponsefunction2(vbstatus_div){
if(AJAX.handler.readyState==4){
document.getElementById(AJAX.testdiv).innerHTML=AJAX.handler.responseText;
}
document.getElementById('mypopup').innerHTML = '';

}
function fireMyPopup2() {
<!-- Due to different browser naming of certain key global variables, we need to do three different tests to determine their values -->

// Determine how much the visitor had scrolled

var scrolledX, scrolledY;
if( self.pageYOffset ) {
  scrolledX = self.pageXOffset;
  scrolledY = self.pageYOffset;
} else if( document.documentElement && document.documentElement.scrollTop ) {
  scrolledX = document.documentElement.scrollLeft;
  scrolledY = document.documentElement.scrollTop;
} else if( document.body ) {
  scrolledX = document.body.scrollLeft;
  scrolledY = document.body.scrollTop;
}

// Determine the coordinates of the center of browser's window

var centerX, centerY;
if( self.innerHeight ) {
  centerX = self.innerWidth;
  centerY = self.innerHeight;
} else if( document.documentElement && document.documentElement.clientHeight ) {
  centerX = document.documentElement.clientWidth;
  centerY = document.documentElement.clientHeight;
} else if( document.body ) {
  centerX = document.body.clientWidth;
  centerY = document.body.clientHeight;
}

  var leftOffset = scrolledX + (centerX - 250) / 2;
  var topOffset = scrolledY + (centerY - 200) / 2;

  document.getElementById("mypopup").style.top = topOffset + "px";
  document.getElementById("mypopup").style.left = leftOffset + "px";
  document.getElementById("mypopup").style.display = "block";


} 

function Att_Ajax(varstring,url)
{
 AJAX = new _ajax(true)
 AJAX.onreadystatechange(myresponsefunction)
 AJAX.send(varstring, 'GET', url)
}
function Att_AjaxDiv(varstring,url,testdiv)
{
 AJAX = new _ajax(true)
AJAX.testdiv = testdiv;
 AJAX.onreadystatechange(myresponsefunction2)
 AJAX.send(varstring, 'GET', url)
}

function Att_AjaxForm(varstring,url)
{
 AJAX = new _ajax(true)
 AJAX.onreadystatechange(myresponsefunction)
 AJAX.send(varstring, 'POST', url)
}