// JavaScript Document
function HideBooks(){
    //check Price, if it is 66, ensure books 7-12 are hidden else, ensure books 7-12 are displayed.
    if (document.getElementById('sub6Mo').checked==true){
        document.getElementById('BooksFor12Mo').style.display='none';
        document.getElementById('BooksFor12Mo').style.visibility='hidden';
        document.getElementById('ShippingCount').value='18';
        document.getElementById('GiftWrap').value='c-Gift Wrap;Yes:price=+2;No';
        document.getElementById('GiftWrapInfo').innerHTML='Gift wrapping for a 6 month subscription is £12';
		document.getElementById('Qty').value='6';
    }else{
        document.getElementById('BooksFor12Mo').style.display='block';
        document.getElementById('BooksFor12Mo').style.visibility='visible';
        document.getElementById('ShippingCount').value='36';
        document.getElementById('GiftWrap').value='c-Gift Wrap;Yes:price=+2;No';
        document.getElementById('GiftWrapInfo').innerHTML='Gift wrapping for a 12 month subscription is £24';
		document.getElementById('Qty').value='12';
    }
}

function ValidateBAMform(){
    var bookMessage = 'Please remember to specify which books you would like to be sent each month'
    if (document.getElementById('sub6Mo').checked==true){
        //Make the item name "6 month Book A Month Subscription"
        document.getElementById('ItemName').value='6 month Book A Month Subscription';
        
        //? Alter weight
        document.getElementById('ShippingCount').value='18';
        
        //? Alter Giftwrap cost?
        document.getElementById('GiftWrap').value='c-Gift Wrap;Yes:price=+2;No';
        document.getElementById('GiftWrapInfo').innerHTML='Gift wrapping for a 6 month subscription is £12';
        
        //clear books 7-12
        document.getElementById('pBook7').value='';
        document.getElementById('pBook8').value='';
        document.getElementById('pBook9').value='';
        document.getElementById('pBook10').value='';
        document.getElementById('pBook11').value='';
        document.getElementById('pBook12').value='';
        document.getElementById('tBook7').value='';
        document.getElementById('tBook8').value='';
        document.getElementById('tBook9').value='';
        document.getElementById('tBook10').value='';
        document.getElementById('tBook11').value='';
        document.getElementById('tBook12').value=''; 
        
        //validate for books 1-6
        if (document.getElementById('pBook1').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook2').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook3').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook4').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook5').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook6').value==''){
            alert(bookMessage);
            return false;
        }else{
            return true;
        }
    }else{
        //Make the item name "12 month Book A Month Subscription"
        document.getElementById('ItemName').value='12 month Book A Month Subscription';
        
        //? Alter weight
        document.getElementById('ShippingCount').value='36';
        
        //? Alter Giftwrap cost?
        document.getElementById('GiftWrap').value='c-Gift Wrap;Yes:price=+2;No';
        document.getElementById('GiftWrapInfo').innerHTML='Gift wrapping for a 12 month subscription is £24';
        
        //validate for books 1-12
        if (document.getElementById('pBook1').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook2').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook3').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook4').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook5').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook6').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook7').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook8').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook9').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook10').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook11').value==''){
            alert(bookMessage);
            return false;
        }else if (document.getElementById('pBook12').value==''){
            alert(bookMessage);
            return false;
        }else{
            return true;
        }        
    }
}