Try this, apply onto the document and use the class filter to attach the event to your button.
Live demo
jQuery(document).on('click','.close', function() {
jQuery('div').slideUp();
jQuery(this).addClass('open');
jQuery(this).removeClass('close');
});
jQuery(document).on('click','.open', function() {
jQuery('div').slideDown();
jQuery(this).addClass('close');
jQuery(this).removeClass('open');
});β
, , ( open close close open) .
, , , .