Transparency images on Graalshop - Help

[Fysez]

I have always used Gif images to place as sprites on Gani's.
But today, I wanted to make a Transparency image to use.

Question 1:
Is it only me, Or does .png images not work on Graalshop?

Question 2:
How would I be able to add a transparent Image to Graalshop,
When Gif doesn't support it, Png doesn't work,
And Mng is not supported Via Gimp/Paint.Net?

Thanks for the help!