Ilya Suhodolskiy

.drop_block{
	display: none;
}

var click_open = $('.click_open'),
    drop_block = $('.drop_block');


click_open.click(function(){
	var _this = $(this),
	    _thisDrop = _this.next(drop_block);
	
	if(!_thisDrop.hasClass('open')){
		drop_block.slideUp(300);
		_thisDrop.addClass('open').slideDown(300);
	} else{
		drop_block.slideUp(300);
		_thisDrop.removeClass('open');
	}
});