/*
   Works best for background images with set dimensions
   Just add a ".pngfix" class to anything you want fixed
   or put in some other jQuery selector.
*/
$('.pngfix').each( function() {
   $(this).attr('writing-mode', 'tb-rl');
   $(this).css('background-image', 'none');
   $(this).css( 'filter', 'progid:DXImageTransform.Microsoft.AlphaImageLoader(src="path/to/image.png",sizingMethod="scale")');
});

/*
   Works best for background images with set dimensions
   Just add a ".pngfix" class to anything you want fixed
   or put in some other jQuery selector.
*/
$(’.pngfix’).each( function() {
   $(this).attr(’writing-mode’, ‘tb-rl’);
   $(this).css(’background-image’, ‘none’);
   $(this).css( ‘filter’, ‘progid:DXImageTransform.Microsoft.AlphaImageLoader(src=”path/to/image.png”,sizingMethod=”scale”)’ );
});

http://itknowledgeexchange.techtarget.com/web-standards/jquery-png-fix-for-ie6-single-instance-images/

This was not written by me, but Jeffrey Olchovy. I uploaded it here because his blog messes up the quotes.

Super Simple jQuery PNG Fix for IE6 background images

javascript, jquery, ie6

jQuery