[jQuery] Click event outside of an element

Hi!

I am newbie in JQuery. I want to catch click event outside and
specified class.

For example, I have a div with class "classname", and I want to attach
some actions when I click outside, in the rest of the page.

I tried with this (to get the classname where I click):

$('*').click(function(){
alert($(this).attr('class'));
});

But not works!

Any idea?

Thanks!

P.D: sorry for the bad english!