ive implemented a draggable section of a site that allows you to drag transparent png products on to a canvas for preview.

when a user selects a product, i want to put a visual effect i.e make the product pulse by changing opacity.

in firefox this works perfectly, however in ie6 when the product pulses it produces a horrid black background on the image(see below)

ive set the background of the draggable div using IE's alphaimageloader

.css('filter', "progidXImageTransform.Microsoft.AlphaImageLoader(src="+newSrc+", sizingMethod='scale')")

any reason why my png's appear this way?