function BookSelectCount()
{
    this.count = 0;
    if(typeof BookSelectCount._initialized == "undefined")
    {
        BookSelectCount.prototype.load = function()
        {
            var packInputs = document.getElementsByClassName('input','lpUnits');
            var bookInputs = document.getElementsByClassName('input','bUnits');            
            this.inputs = new Array();
            this.inputs = packInputs.concat(bookInputs);  
            //alert(packInputs.length + ' + ' + bookInputs.length + ' = ' + this.inputs.length);
            
            for(var i = 0; i < this.inputs.length; i++)
            {
                if(document.attachEvent)
                {
                  this.inputs[i].onblur = function(oEvent){countBookSelected();}; 
                } else {
                  this.inputs[i].setAttribute('onblur','countBookSelected(event)'); 
                }  
            }
        };
        
       
        
        BookSelectCount._VALIDPAGE = (typeof document.forms[0].PageType != 'undefined' && document.forms[0].PageType.value != 'onixProduct' && document.forms[0].PageType.value != 'home' && typeof document.forms[0].Template != 'undefined' && document.forms[0].Template.value == 'domPrimary');
               
    }
    BookSelectCount._initialized = true;
    
    
    if(BookSelectCount._VALIDPAGE)
    {
        this.load();
    }
}

function countBookSelected(oEvent)
{
    var target = stopEvent(oEvent);
    var counted = (target.getAttribute('counted') != null && target.getAttribute('counted')== 'yes');
    if(oCart.items.length < 85 && booksSelected.count < 85 &&((oCart.items.length + booksSelected.count) < 85))
    { 
        if(!counted && target.value != "")
        {       
           booksSelected.count += 1;
           target.setAttribute('counted','yes');
        } else {
                   if(counted)booksSelected.count -= 1;
                   target.setAttribute('counted','no');
               }  
    } else {
        
        if(oCart.items.length >= 85)
        {
            if(target.value != "")
            {
                alert('You have reached the maximum number of items allowed per order.\nPlease click Checkout to finalise this order before ordering more items.');
            }
        } else {
                   alert('You have selected the maximum number of items allowed per order.\nPlease click Add to order and then Checkout to finalise this order before selecting more items.');
               }
        target.setAttribute('counted','no');
        target.value = "";
    } 
   // target.value = booksSelected.count;
}

//addLoadEvent(function(){var booksSelected = new BookSelectCount();});
var booksSelected = new BookSelectCount();
//alert(booksSelected.count);