[jQuery] A 5 line script that doesn't work in IE

[Gordan]

I'm loosing my mind over this :-(
http://www.writesomething.net/users/ ("show classical users list"
link)
I have a few lines of code which are extremly simple and work as
expected in FF, but IE is refusing to cooperate :-(
I tried literally everything but it just returns the "expected
identifier, string or number" error.
Please help, this has to be some simple bug that I'm overseeing :-
( thank you
here's the complete code, and I use the latest 1.2.1 jQuery: (IE says
that the error is on the 3rd line)

function change_users_display() {
if ($('#users').attr('class') == 'users_cloud') {
$('#users').attr({class: ''});
$('#change_users_display_classical').show();
$('#change_users_display_cloud').hide();
} else {
$('#users').attr({class: 'users_cloud'});
$('#change_users_display_classical').hide();
$('#change_users_display_cloud').show(); }
return true; }