$(document).ready(function(){
  
  // Referenties
  $(".ref_con A").click(function() {
    
    // Find family
    var parent  = $(this).parents(".ref_con");
    var sister  = parent.find(".ref_quo");
    var brother = parent.find(".ref_tex");
    
    if (parent.hasClass('open')) {
      parent.removeClass('open');
      brother.slideUp('slow');
      sister.slideDown('slow');
    } else {
      parent.addClass('open');
      sister.slideUp('slow');
      brother.slideDown('slow');
    }
  });
  
});