PNG image not transparent on website, cannot find out why

Question

I am working on a dutch site and i am having a problem with the logo of it. I saved the logo as PNG24 sothat the characters "hvb" in the logo will be transparent. for some odd reason, it shows the characters in plain old white.

Could somebody please tell me how this is possible. By the way: it is not caused by the h1 tag it is wrapped around.

http://www.luukratief-design.nl/wp/

Help would be appreciated

EDIT:

I have never seen this befor, but you guys where right! The image HAS indeed have white letters! The odd part about it is that the layers were hidden, so they look transparent in photoshop. Once i used save for web and exported it to png, all of a sudden they are white. Take a look at the screeny:

The solution: As stupid as it sounds, i deleted the white layers (which werent even visible), and exported it again. As you can see it works now.

I can only choose 1 right answer, so i will choose the first guy who pointed this out. Thanks guys. Still strange, but thanks!

Answer 1

The letters are white in the image file.