History: PngBug
Preview of version: 1
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Transparent PNGs
In Internet Explorer before version 7, transparent pngs are displayed with a light blue-grey background. This isn't a TikiWiki specific bug, rather a generic IE bug.
The PNG support in IE before version 7 is frankly awful. In addition to its inability to render transparent PNGs, IE also has a tendancy to reduce the colour pallete and/or dither the image depending on various factors. The problems are pretty widely known and a Google search will provide further details and suggested workarounds.
Tweak the image
PNG Behaviour
Server-side replace with GIF
JavaScript solution
JavaScript solution
Note that there doesn't appear to be a complete solution for background images in DIVs. Any attempt to use a filter results in either the replaced image scaling to fill the entire DIV, or the text being clipped to the bounding box of the image.