JQuery :: Hide Multiple DIVs - Two Classes For One Element?

I made this small piece of code, and I think I made it in a very drawn out way. I am sure there is a lot quicker way to do it. I want all divs to be cleared that are in a certain div. So when one link is clicked, the visible div is replaced with the new one (depending on the link)

Here is the code I have done...
$(document).ready(function(){
$(".untitled1link").click(function(){
$('.untitled1, .untitled2, .untitled3, .untitled4, .untitled5_1, .untitled5_2, .untitled5_3, .wall, .lightswitch, .detritus, .untitled6, .table, .socket, .socket2').hide();
$(".untitled1").fadeIn('5');
});
});

I just need a way to say clear all in that certain div, rather than having to name each class. I was thinking of giving each of those another class which is uniform across them all. But I don't think you can have two classes.