Fake AJAX

When a page posts back (for example when you click a button on a form), it normally causes a screen flicker as the page is redrawn. In a lot of cases the screen that is redrawn is very similar to the previous screen, and the flicker is an annoyance, disrupting the user's experience. The Blendtrans function causes the old page to blend smoothly into the new one, rather than flickering.

A lot of the time, this gives an identical effect to an ajax style http request. The page appears to have stood absolutely still as just one part of it is updated.

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