The ready function gets a copy of the elements specified in the selector--not a reference to the jQuery object.
That's not true. The ready fn is passed a jQuery object so that you
can alias it as needed. A common usage pattern is:
jQuery.noConflict();
jQuery(document).ready(function($) {
// use the $ here safely to ref jQuery
$().ajaxStart($.blockUI).ajaxStop($.unblockUI);
});

