//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="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){
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.ajaxobj.onreadystatechange=callbackfunc
this.ajaxobj.open('GET', url+"?"+parameters, true)
this.ajaxobj.send(null)
}
}

ajaxpack.postAjaxRequest=function(url, parameters, callbackfunc, filetype){
ajaxpack.ajaxobj=createAjaxObj() //recreate ajax object to defeat cache problem in IE
if (this.ajaxobj){
this.filetype=filetype
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);
}
}



function parseXML(text)
{
try //Internet Explorer
  {
  xmlDoc=new ActiveXObject("Microsoft.XMLDOM");
  xmlDoc.async="false";
  xmlDoc.loadXML(text);
  }  
catch(e)
  {
  try // Firefox, Mozilla, Opera, etc.
    {
    parser=new DOMParser();
    xmlDoc=parser.parseFromString(text,"text/xml");
    }
  catch(e)
    {
    alert(e.message);
    return;
    }
  }
}


//Step 2: Define a "callback" function to process the data returned by the Ajax request:
function processGetPost(){
var codesubmit=document.codesubmit.discountcode.value;
pricebox = document.getElementById("theprice");
paypalprice = document.forms[0].amount;
box = document.getElementById("discountbox");
box.style.display = "none";

//var loadingboxdiv = document.getElementById("loadingbox");
//var linkvalue=document.getElementById("imagelink");
//var holder=document.getElementById("holder");
//var gallerytext=document.getElementById("gallerytext");
//loadingimage=new Image();
//loadingimage.src = "images_common/loading_ajax.gif";
//loadingboxdiv.style.display = 'block';
//loadingboxdiv.innerHTML = '<div style="background-color:white;padding:10px;border:1px solid #000;display:block;width:60px;color:#000;font-size:10px" align="center"><img src="images_common/loading_ajax.gif"> Loading...</div>';
var myajax=ajaxpack.ajaxobj
var myfiletype=ajaxpack.filetype
if (myajax.readyState == 4){ //if request of file completed
if (myajax.status==200 || window.location.href.indexOf("http")==-1){ //if request was successful or running script locally

parseXML(myajax.responseText);
var actualcode = xmlDoc.getElementsByTagName("discountcode").item(0).childNodes.item(0).nodeValue;
var originalprice = xmlDoc.getElementsByTagName("originalprice").item(0).childNodes.item(0).nodeValue;


if(actualcode == codesubmit){
	if(paypalprice.value != originalprice){
		paypalprice.value = originalprice;
	}
	
	var newprice = roundNumber((paypalprice.value-(paypalprice.value*.2)),2);
	pricebox.innerHTML = newprice;
	paypalprice.value = newprice;
	clickbutton = document.getElementById("clickfordiscount");
	clickbutton.style.display = "none";
}


//galleryimagesrc.src = 'images/med_'+theimage;
//holder.src = galleryimagesrc.src;
//linkvalue.href = 'images/'+theimage;
//holder.onload=function(){

//slideit('holder');
//galleryimage.src = galleryimagesrc.src;

//loadingboxdiv.style.display = 'none';
//var newtext = unescape(xmlDoc.getElementsByTagName("caption").item(0).childNodes.item(0).nodeValue);
//gallerytext.innerHTML=newtext;
//linkvalue.title = newtext;


}
}
}

function doit(price){
ajaxpack.getAjaxRequest('../discountcode.php', 'price='+price, processGetPost, 'xml');
}


	function getWindowHeight() {
			var windowHeight = 0;
			if (typeof(window.innerHeight) == 'number') {
				windowHeight = window.innerHeight;
			}
			else {
				if (document.documentElement && document.documentElement.clientHeight) {
					windowHeight = document.documentElement.clientHeight;
				}
				else {
					if (document.body && document.body.clientHeight) {
						windowHeight = document.body.clientHeight;
					}
				}
			}
			return windowHeight;
		}


function positionit(){
box = document.getElementById("discountbox");
var iebody=(document.compatMode && document.compatMode != "BackCompat")? document.documentElement : document.body

//define universal dsoc left point
var dsocleft=document.all? iebody.scrollLeft : pageXOffset;
//define universal dsoc top point
var dsoctop=document.all? iebody.scrollTop : pageYOffset;

//if the user is using IE 4+ or Firefox/ NS6+
if (document.all||document.getElementById){
box.style.top=dsoctop+((getWindowHeight()/2)-150)+"px";
}
else{
box.style.top=dsoctop+((getWindowHeight()/2)-150)+"px";
}
}



function discountbox(){
positionit();
box = document.getElementById("discountbox");
box.style.display = "block";
}


function roundNumber(num, dec) {
	var result = Math.round(num*Math.pow(10,dec))/Math.pow(10,dec);
	return result;
}
//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 ////////////////////////////////////////////
/* Comment begins here

//Define call back function to process returned data
function processGetPost(){
var myajax=ajaxpack.ajaxobj
var myfiletype=ajaxpack.filetype
if (myajax.readyState == 4){ //if request of file completed
if (myajax.status==200 || window.location.href.indexOf("http")==-1){ if request was successful or running script locally
if (myfiletype=="txt")
alert(myajax.responseText)
else
alert(myajax.responseXML)
}
}
}

/////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 */