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.
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The general idea is to create a div that covers the entire viewport and has a high z-index, with some level of opacity set. A quick look at the BlockUI source should help you to write your own.