[jQuery] DOM element as message when blocking element

[HJ]

I seem to have found a bug. If I try to use $('#someelement').block
({ message: $('#loadingMessage') });
Then when I unblock with $('#someelement').unblock(); the loading
message is removed from the DOM, so any subsequent calls to block it
fail and cause a JS error. Everything works fine if I block the whole
page with  $.blockUI({ message: $('#loadingMessage') }); then
$.unblockUI(); but I don't want to block the whole UI.

Is this a bug or am I doing something wrong?