function PriceAvailability(isbn,quantity)
{
    this.isbn = isbn;
    this.quantity = 1;
    if(quantity)this.quantity = quantity;
    
    // GET request variables
    this.searchVars = new Array();
    this.searchVars['ClientID'] = 'PAL';
    //this.searchVars['ClientPassword'] = 'xxxx';
    this.searchVars['ProductIDType'] = '15';
    if(isbn)this.searchVars['ProductIDValue'] = isbn;    
    this.searchVars['SupplyQuantity'] = this.quantity;
    this.searchVars['CurrencyCode'] = 'AUD';
    
    
    if(typeof PriceAvailability._initialized == 'undefined')
    {
        PriceAvailability.prototype.load = function()
        {
            this.loadAjax();
            this.getPrice();
            this.getAvailability();
            this.getShipDate();
        };



// old ajax function       
        PriceAvailability.prototype.loadAjax = function()
        {
            //var sUrl = 'http://palgravedev.itechne.com/site/OnixPA02.nsf/PAService?readform&' + this.getSearchVars();
            //var sUrl = 'http://secondarydev.itechne.com/macmillan/OnixPA01.nsf/PAService?readform&' + this.getSearchVars();
            //var sUrl = 'http://secondarydev.itechne.com/site/OnixPA02.nsf/PAService?readform&' + this.getSearchVars();
            //var sUrl = 'http://primarydev.itechne.com/files/priceandavailability/' + this.isbn + '.xml?' + this.getSearchVars();
            var sUrl = '/site/OnixPA02.nsf/PAService?readform&' + this.getSearchVars();
            
            var oXHR = createXHR();
            oXHR.open('GET',sUrl,false);
            oXHR.send(null); 
            if(!(oXHR.readyState == 4 && (oXHR.status == 200 || oXHR.status == 304))) return false;

            try 
            {
                        var responseType = oXHR.responseXML.getElementsByTagName('ResponseType')[0].hasChildren;
            }
            catch (err) {}

            if(!responseType)
            {
                this.xml = oXHR.responseXML;
            } else {
                        this.xml = null;
                   }
        };
        
        PriceAvailability.prototype.getSearchVars = function()
        {
            var tempArray = new Array();
            for(i in this.searchVars)
            {
                tempArray.push(i + '=' + this.searchVars[i]);
            }
            return (tempArray.join('&'));
        };
        
        PriceAvailability.prototype.parseXML = function(text)
        {
            // code for IE
            if (window.ActiveXObject)
            {
                var doc=new ActiveXObject("Microsoft.XMLDOM");
                doc.async="false";
                doc.loadXML(text);
            } else { // code for Mozilla, Firefox, Opera, etc.
                        var parser=new DOMParser();
                        var doc=parser.parseFromString(text,"text/xml");
                   }
            return doc;
        };
        
        PriceAvailability.prototype.getPrice = function()
        {
            if(!this.xml)return;

                    var getLevel1 = XMLWalk(this.xml.childNodes, "PriceAvailabilityResponse");
                    var getLevel2 = XMLWalk(getLevel1, "ProductPriceAvailability");
                    var getLevel3 = XMLWalk(getLevel2, "SupplierPriceAvailability");
                    var getLevel4 = XMLWalk(getLevel3, "RetailPrice");
                    var getLevel5 = XMLWalk(getLevel4, "PriceAmount");
                    //alert(getLevel5[0].nodeValue);

                    var oPrice = getLevel5[0].nodeValue;

            
            //var oPrice = this.xml.getElementsByTagName('SupplierPriceAvailability')[0].getElementsByTagName('PriceAmount')[0].firstChild.nodeValue;
            
            //if book not found
            if(oPrice == 'Entry not found in index')return;
            
            if(oPrice.indexOf('$') != -1)
            {
                this.price = oPrice;
            } else {
                        this.price = '$' + oPrice;
                   }
        };
        
        PriceAvailability.prototype.getAvailability = function()
        {
            if(!this.xml)return;


                    // XMLWalk for Instock
                    var getLevel1 = XMLWalk(this.xml.childNodes, "PriceAvailabilityResponse");
                    var getLevel2 = XMLWalk(getLevel1, "ProductPriceAvailability");
                    var getLevel3 = XMLWalk(getLevel2, "SupplierPriceAvailability");
                    var getLevel4 = XMLWalk(getLevel3, "InStock");
                    if (!getLevel4[0]) return;
                    var oAvailability = getLevel4[0].nodeValue;

                    


            
            //var oAvailability = this.xml.getElementsByTagName('SupplierPriceAvailability')[0].getElementsByTagName('InStock')[0].firstChild;
            if(!oAvailability)return;
            //oAvailability = oAvailability.nodeValue;
            if(oAvailability.toLowerCase().indexOf('true') != -1)
            {
                this.available = true;
            }
        };
        
        PriceAvailability.prototype.getShipDate = function()
        {
            if(!this.xml || this.available)return;

                    var getLevel1 = XMLWalk(this.xml.childNodes, "PriceAvailabilityResponse");
                    var getLevel2 = XMLWalk(getLevel1, "ProductPriceAvailability");
                    var getLevel3 = XMLWalk(getLevel2, "SupplierPriceAvailability");
                    var getLevel4 = XMLWalk(getLevel3, "ExpectedShipDate");
                    //var shipDate = getLevel4[0].nodeValue;
if (getLevel4[0] == null) return;
var shipDate = getLevel4[0].nodeValue;
            
            //var shipDate = this.xml.getElementsByTagName('SupplierPriceAvailability')[0].getElementsByTagName('ExpectedShipDate')[0].firstChild;
            //if(!shipDate || shipDate.nodeValue.length != 8)return;
            //if(!shipDate || shipDate.length != 8)return;

if (!shipDate)return;
if (shipDate.length != 8)return;


            //shipDate = shipDate.nodeValue;
            
            var year = parseInt(shipDate.substring(0,4));
            // strip leading zeros
            if  (shipDate.substring(4,5)=="0") {
            var month = parseInt(shipDate.substring(5,6));
            }
            else {
            var month = parseInt(shipDate.substring(4,6));    
            }  
            if  (shipDate.substring(6,7)=="0") {
            var day = parseInt(shipDate.substring(7,8));
            }
            else {
            var day = parseInt(shipDate.substring(6));
            }   
            
            //parse string as date
            var tempDate = new Date();
            //tempDate.setYear(year);
            //tempDate.setDate(day);
            //tempDate.setMonth(month - 1);
            tempDate.setFullYear(year,month - 1,day);
            var currentDate = new Date();
            
            //tempDate.setHours(0,0,0,0);
            //currentDate.setHours(0,0,0,0);
            
            if(tempDate < currentDate)return;
           
            this.shipDate = tempDate;            
            /*
            var oP = document.createElement('p');
            oP.appendChild(document.createTextNode(this.isbn + ':   ' + shipDate + '   ' + tempDate.toGMTString()));
            document.body.appendChild(oP);
            */
        };
        
        PriceAvailability.prototype.parseShipDateAsString = function()
        {
            if(this.shipDate)
            {
                var tempArray = new Array();
                
                if(this.shipDate.getDate() < 10)
                {
                    tempArray.push('0' + this.shipDate.getDate().toString());
                } else {
                            tempArray.push(this.shipDate.getDate().toString());
                       }
                        
                if(this.shipDate.getMonth() < 10)
                {
                    tempArray.push('0' + (this.shipDate.getMonth() + 1).toString());
                } else {
                            tempArray.push((this.shipDate.getMonth() + 1).toString());
                       }
                       
                tempArray.push(this.shipDate.getFullYear().toString());
                
                var shipDate = tempArray.join('/');
            } else {
                        var shipDate = null;
                   }
           
           return shipDate;
        };
        /*
        PriceAvailability.prototype.getShipDateString = function()
        {
            if(this.shipDate)
            {
                var tempArray = new Array();
                
                if(this.shipDate.getDate() < 10)
                {
                    tempArray.push('0' + this.shipDate.getDate().toString());
                } else {
                            tempArray.push(this.shipDate.getDate().toString());
                       }
                        
                if(this.shipDate.getMonth() < 10)
                {
                    tempArray.push('0' + (this.shipDate.getMonth() + 1).toString());
                } else {
                            tempArray.push((this.shipDate.getMonth() + 1).toString());
                       }
                       
                tempArray.push(this.shipDate.getFullYear().toString());
                
                var shipDate = tempArray.join('/');
            } else {
                        var shipDate = 'no date available';
                   }
           
           return 'Available - ' + shipDate;
        };
        */
        
        PriceAvailability.prototype.getShipDateString = function()
        {
            var shipDate = this.parseShipDateAsString();
            if(!shipDate)
            {
                shipDate = 'no date available';
            }
            
           return 'Available - ' + shipDate;
        };
        
        PriceAvailability.prototype.getShipDateStringBookDetail = function()
        {
            var shipDate = this.parseShipDateAsString();
            if(!shipDate)
            {
                shipDate = 'no date available';
            }
            
           return 'Available: <span>' + shipDate + '</span>';
        };
        
        PriceAvailability.prototype.getShipDateStringForSummary = function()
        {
            var shipDate = this.parseShipDateAsString();
            if(!shipDate)
            {
                return  'no date available';   
            } else {
                        return shipDate;
                   }
        };
    }
    PriceAvailability._initialized = true;
    this.load();
}

function createXHR() //create cross-browser XHR object
{
    if (typeof XMLHttpRequest != "undefined") 
    {
        return new XMLHttpRequest();
    } else if (window.ActiveXObject) 
           {
        var aVersions = [ "MSXML2.XMLHttp.6.0", "MSXML2.XMLHttp.3.0"];
        for (var i = 0; i < aVersions.length; i++) 
        {
            try {
                var oXHR = new ActiveXObject(aVersions[i]);
                return oXHR;
            } catch (oError) {
            //Do nothing
            }
        }
    }
    throw new Error("XMLHttp object could not be created.");
}


function XMLWalk(nodesToWalk, FindByName)
{
    for (var i=0; i < nodesToWalk.length; i++) { if (nodesToWalk[i].nodeType == 1 && nodesToWalk[i].nodeName == FindByName) { return nodesToWalk[i].childNodes; } }
}