No HTTP-Request is needed for this alpha transparency solution

In this document, body is styled with a background image and that same PNG file is the src value of 3 img elements (see below).

A dynamic property applies the filter to every PNG image found in the document.

The dimensions of the image below is set in EM (inline styling).

Original dimensions - width set via the width attribute

No dimensions are set for the image below - which should prevent it from appearing in IE 6.