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  $(document).ready(function(){
    $('.fbutton').click(function() { // when I click a filter button, and... 
      if ($(this).hasClass("on")) { // if the button is on, then...
	$(this).removeClass("on"); // turn the button off and...
        $('.A369,.D369,.E369,.F369,.N500,.N600').addClass("on").removeClass("off"); //show all articles
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	$('.fbutton').removeClass("on"); //turn all buttons off and...
	$(this).addClass("on"); //turn the clicked button on and...
	$('.A369,.D369,.E369,.F369,.N500,.N600').addClass("off").removeClass("on"); //hide all articles...
        //except for the ones corresponding to the button that was clicked
	if ($(this).hasClass("A369b")) { $('.A369').addClass("on").removeClass("off"); }
        if ($(this).hasClass("D369b")) { $('.D369').addClass("on").removeClass("off"); }
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