Best way to achieve blockUI functionality WITHOUT using jQuery or any other library?
<p>As much as I love jQuery, it is not always possible to use open source libraries (for reasons having nothing to do with technology). How best to achieve BlockUI functionality using raw javascript?  I am really only interested in making it obvious to the user that the browser is busy, and preventing the user from making any more selections.  My jQuery-less situations happen to involve only IE 6, so IE 6 is all I'm interested in at this time.  I'm trying to avoid a "copy/paste the relevant parts of BlockUI" type of solution.</p>
