Add the following to your header area specifically to target IE6. Do this on every page where you want PNG coverage.
<!–[if lt IE 7]>
If you wish the script to work on only specific images, add a class of unitpng to those elements. This will cause only the specified elements to be fixed with this script. The script has been updated to fix any flickering issues that were present before.
So there you go. You can now use transparent PNG images in your projects knowing they will look nice and pretty in IE6.