The className of a dialog bug.

Hi All,
The last version from the SVN, file ui.dialog.js, line 65.
~~~~~~~~~~~
.addClass('ui-dialog')
~~~~~~~~~~~
It looks we missed the old className here, maybe we should use
~~~~~~~~~~~~
.addClass('ui-dialog').addClass(uiDialogContent.attr('className'))
~~~~~~~~~~~~
instead of it to resolve this bug.
Thanks for your great works, please fix it as soon as possible.