// Load event handler
$(document).ready(function() {

 var currentCounter = $('.hdfield').val();

//Keep record of amount selected checkboxes
   $('input:checkbox').click(function(){
        if (!($(this).is(':checked'))){
             if (!($('.hdfield').val() == 0)){
                currentCounter --;
                $('.hdfield').val(currentCounter);             
            }
        }else{
            if ($('.hdfield').val() == 2){
                alert('Er mogen maar maximaal 2 voorkeursimulaties gekozen worden');
               $(this).removeAttr('checked');
            }else{
                currentCounter ++;
                $('.hdfield').val(currentCounter);          
            }
        }
    });



});