jQuery.fn.fadeToggle = function(speed, easing, callback) {
   return this.animate({opacity: 'toggle'}, speed, easing, callback);

}; 

	jQuery('.fb_entry').each(function() {
		var parent = jQuery(this);
		jQuery(this).find(".fb_info_tab").click(function () {
	     parent.find(".fb_info").fadeToggle('fast','linear',function() { 
			// callback
		});
		 parent.find("table").toggleClass('toggle');
	    });
	});

jquery fadeToggle

jQuery