[jQuery] How could I pass an object into an eval statement

[AsymF]

For instance, say a function is passed an object and that function is
supposed to set an event to fire on a timeout, how would I do it? Even
more complicated, how would I do it if I needed to perform the action
on a sub-selection of the object passed?

If I wanted to do this and I have just id's, then I could do the
following:
setTimeout("$(#'" + obj.id + " #message').fadeOut('slow', function ()
{$(this).remove();});", 5000);

But what if the object passed doesn't have an id?