[jQuery] treeview async - callback on completion? (or some other way to do temporary "loading..." text)

[Max Williams (Brighton)]

I'm using the async version of the treeview plugin to deal with a
rather large tree.  When the user first loads it there's nothing
there, and quite a delay before the main set of branches loads, and
i'd like to have some 'loading...' text there.

How can i get the treeview to signal when it's finished loading the
json, so i can remove the text?  Is there a simpler way to have some
"loading..." text displayed so that it will disappear when the tree
loads?

thanks
max