png Button Set

I'm using a custom template and in the process of changing the button set. If I make my new button set as either .gif or .jpg the new buttons work fine. But I'd like to use a .png set due to some background differences.

The problem is, when I try a .png button it does not load up and I see the default button set.
src="includes/templates/template_default/buttons/english/button_login.gif"

My new .gifs all load from my custom template as I would expect.
src="includes/templates/custom/buttons/english/button_login.gif

I cant think what I need to do?

Did you change the button names in includes/languages/english/CUSTOM/button_names.php ?

Of course, if you don't have this file in your custom templates' folder, then you'll need to make a copy from includes/languages/english/button_names.php

Brilliant....thank you.

Not a problem. Glad to help.