png v. wbmp in Servlets returning Wap-Wml

[SUBSCRIBE SERVLET-INTEREST Lucy]

Hi
I've used png format in midlets, but having trouble using png instead of wbmp in Wap 
Servlets, ie. Servlets returning WML to a WAP mobile.  I've taken a guess at mapping 
mime-type in web.wml as :
image/vnd.wap.png

And within the Servlet returning WML to a WAP phone, I've guessed: 
response.setContentType("image/vnd.wap.png");

But my guesses are wrong as it's not working.  So,
1.  Is only wbmp widely supported for WAP-WML?
2.  Is there any way to use png in a Servlet returning WAP-WML to a mobile?
Thanks for any help.  Cheers, Lucy

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