setting cursor to wait document-wide

This is the only solution I've found to get a wait cursor document-wide:

function Busy()
{
if (document.all) for (var i=0;i < document.all.length; i++)
document.all(i).style.cursor = 'wait';
}

Sadly, for pages with a lot of elements, its performance is not acceptable.

Any ideas?

TIA,
Paul


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