jQuery module to show hour glass and/or dark screen?
<p>I want a jQuery (or plain JS) module which indicates that the script is now busy.</p>

<p>This may be implemented as hour glass cursor, dark background before the Web page, or rotating circle (as in YouTube), or a combination thereof.</p>

<p>I'd prefer if this modules does not require to insert any additional HTML code into the page manually.</p>
