After closing #message_content, I can't open it =(

common.js

$(".subject").click( function() {
	var message_id = $(".subject").data("message-id");
	if ($("#message_content").html() == ''){
		$.get("/friends_com/messages/view/"+message_id+"", function(data) {
			$("#message_content").fadeIn('slow', function() {
				$("#message_content").html(data);
			})			
		});
	} else {
		$("#message_content").fadeOut();
	}
});