//Basic Ajax Routine- Author: Dynamic Drive (http://www.dynamicdrive.com)
//Last updated: Jan 15th, 06'


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 = '';
ajaxpack.ajaxobj = createAjaxObj()
ajaxpack.filetype = "txt"
ajaxpack.addrandomnumber = 1 //Set to 1 or 0. See documentation.


ajaxpack.getAjaxRequest=function(obj, url, parameters){
  if (document.ResetTimeOut) document.ResetTimeOut();
  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='txt'
     this.ajaxobj.onreadystatechange=function() {
        if((obj!=''&&ajaxpack)&&(ajaxpack.ajaxobj.readyState == 4)&&(ajaxpack.ajaxobj.status==200 || window.location.href.indexOf("http")==-1)) {
           document.getElementById(obj).innerHTML=ajaxpack.ajaxobj.responseText; } }
     this.ajaxobj.open('GET', ajaxpack.basedomain+url+"?"+parameters, true)
     this.ajaxobj.send(null) } }

ajaxpack.postAjaxRequest=function(obj, url, parameters){
  if (document.ResetTimeOut) document.ResetTimeOut();
  ajaxpack.ajaxobj=createAjaxObj() //recreate ajax object to defeat cache problem in IE
  if (this.ajaxobj){ this.filetype="txt"
                     this.ajaxobj.onreadystatechange=function() {
                         if((obj!=''&&ajaxpack)&&(ajaxpack.ajaxobj.readyState == 4)&&(ajaxpack.ajaxobj.status==200 || window.location.href.indexOf("http")==-1)) {
                             document.getElementById(obj).innerHTML=ajaxpack.ajaxobj.responseText; } }
                     this.ajaxobj.onreadystatechange = function() { if(obj!=''&&ajaxpack) document.getElementById(obj).innerHTML=ajaxpack.ajaxobj.responseText; };
                     this.ajaxobj.open('POST', ajaxpack.basedomain+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); }
}

var ajaxpackA=new Object()
ajaxpackA.basedomain = '';
ajaxpackA.ajaxobj = createAjaxObj()
ajaxpackA.filetype = "txt"
ajaxpackA.addrandomnumber = 1 //Set to 1 or 0. See documentation.


ajaxpackA.getAjaxRequest=function(obj, url, parameters){
  if (document.ResetTimeOut) document.ResetTimeOut();
  ajaxpackA.ajaxobj=createAjaxObj() //recreate ajax object to defeat cache problem in IE
  if (ajaxpackA.addrandomnumber==1) //Further defeat caching problem in IE?
  var parameters=parameters+"&ajaxcachebust="+new Date().getTime()
  if (this.ajaxobj){
     this.filetype='txt'
     this.ajaxobj.onreadystatechange=function() {
        if((obj!=''&&ajaxpackA)&&(ajaxpackA.ajaxobj.readyState == 4)&&(ajaxpackA.ajaxobj.status==200 || window.location.href.indexOf("http")==-1)) {
           document.getElementById(obj).innerHTML=ajaxpackA.ajaxobj.responseText; } }
     this.ajaxobj.open('GET', ajaxpackA.basedomain+url+"?"+parameters, true)
     this.ajaxobj.send(null) } }

ajaxpackA.postAjaxRequest=function(obj, url, parameters){
  if (document.ResetTimeOut) document.ResetTimeOut();
  ajaxpackA.ajaxobj=createAjaxObj() //recreate ajax object to defeat cache problem in IE
  if (this.ajaxobj){ this.filetype="txt"
                     this.ajaxobj.onreadystatechange=function() {
                         if((obj!=''&&ajaxpackA)&&(ajaxpackA.ajaxobj.readyState == 4)&&(ajaxpackA.ajaxobj.status==200 || window.location.href.indexOf("http")==-1)) {
                             document.getElementById(obj).innerHTML=ajaxpackA.ajaxobj.responseText; } }
                     this.ajaxobj.onreadystatechange = function() { if(obj!=''&&ajaxpackA) document.getElementById(obj).innerHTML=ajaxpackA.ajaxobj.responseText; };
                     this.ajaxobj.open('POST', ajaxpackA.basedomain+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); }
}

//ACCESSIBLE VARIABLES (for use within your callback functions):
//1) ajaxpack.ajaxobj //points to the current ajax object
//2) ajaxpack.filetype //The expected file type of the external file ("txt" or "xml")
//3) ajaxpack.basedomain //The root domain executing this ajax script, taking into account the possible "www" prefix.
//4) ajaxpack.addrandomnumber //Set to 0 or 1. When set to 1, a random number will be added to the end of the query string of GET requests to bust file caching of the external file in IE. See docs for more info.

//ACCESSIBLE FUNCTIONS:
//1) ajaxpack.getAjaxRequest(url, parameters, callbackfunc, filetype)
//2) ajaxpack.postAjaxRequest(url, parameters, callbackfunc, filetype)

///////////END OF ROUTINE HERE////////////////////////


//////EXAMPLE USAGE ////////////////////////////////////////////

//Define call back function to process returned data
function processGetPost(obj){
  var myajax=ajaxpack.ajaxobj
  document.getElementById(obj).innerHTML=myajax.responseText;
}

/* Comment begins here

/////1) GET Example- alert contents of any file (regular text or xml file):

ajaxpack.getAjaxRequest("example.php", "", processGetPost, "txt")
ajaxpack.getAjaxRequest("example.php", "name=George&age=27", processGetPost, "txt")
ajaxpack.getAjaxRequest("examplexml.php", "name=George&age=27", processGetPost, "xml")
ajaxpack.getAjaxRequest(ajaxpack.basedomain+"/mydir/mylist.txt", "", processGetPost, "txt")

/////2) Post Example- Post some data to a PHP script for processing, then alert posted data:

//Define function to construct the desired parameters and their values to post via Ajax
function getPostParameters(){
var namevalue=document.getElementById("namediv").innerHTML //get name value from a DIV
var agevalue=document.getElementById("myform").agefield.value //get age value from a form field
var poststr = "name=" + encodeURI(namevalue) + "&age=" + encodeURI(agevalue)
return poststr
}

var poststr=getPostParameters()

ajaxpack.postAjaxRequest("example.php", poststr, processGetPost, "txt")
ajaxpack.postAjaxRequest("examplexml.php", poststr, processGetPost, "xml")

Comment Ends here */