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        function customCheckbox(checkboxName){    
    var checkBox = $('input[name="'+ checkboxName +'"]');
        $(checkBox).each(function(){
          $(this).wrap( "<span class='custom-checkbox' ></span>" );
            if($(this).is(':checked')){
            $(this).parent().addClass("selected");
        }
      });
        
        
        $(checkBox).click(function(){
            $(this).parent().toggleClass("selected");
          
        });
    };
  
      $(document).ready(function (){
        customCheckbox("option");
        
        });