function createAjaxObj() {
  var httprequest = false
  if ( window.XMLHttpRequest ) { // if Mozilla, Safari etc
    httprequest = new XMLHttpRequest()
    if ( httprequest.overrideMimeType ) {
      httprequest.overrideMimeType('text/xml')
    }
  }
  else if ( window.ActiveXObject ) { // if IE
    try {
      httprequest = new ActiveXObject("Msxml2.XMLHTTP");
    } 
    catch (e){
      try{
        httprequest = new ActiveXObject("Microsoft.XMLHTTP");
      }
      catch (e){}
    }
  }
  return httprequest
}

var ajaxpack = new Object()
ajaxpack.basedomain = "http://"+window.location.hostname
ajaxpack.ajaxobj = createAjaxObj()
ajaxpack.filetype = "txt"
ajaxpack.addrandomnumber = 0 //Set to 1 or 0. See documentation.

ajaxpack.getAjaxRequest = function(url, parameters, callbackfunc, filetype, callback_parameter) {
  ajaxpack.ajaxobj = createAjaxObj() //recreate ajax object to defeat cache problem in IE
  if ( ajaxpack.addrandomnumber == 1 ) //Further defeat caching problem in IE?
    var parameters=parameters+"&ajaxcachebust="+new Date().getTime()
  if ( this.ajaxobj ) {
    this.filetype = filetype
    this.callback_parameter = callback_parameter;
    this.ajaxobj.onreadystatechange = callbackfunc
    this.ajaxobj.open('GET', url+"?"+parameters, true)
    this.ajaxobj.send(null)
  }
}

ajaxpack.postAjaxRequest = function(url, parameters, callbackfunc, filetype, callback_parameter) {
  ajaxpack.ajaxobj = createAjaxObj() //recreate ajax object to defeat cache problem in IE
  if ( this.ajaxobj ) {
    this.filetype = filetype
    this.callback_parameter = callback_parameter;
    this.ajaxobj.onreadystatechange = callbackfunc;
    this.ajaxobj.open('POST', url, true);
    this.ajaxobj.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
    this.ajaxobj.setRequestHeader("Content-length", parameters.length);
    this.ajaxobj.setRequestHeader("Connection", "close");
    this.ajaxobj.send(parameters);
  }
}