owa_util.mime_header('image/gif');

Hi, 17th aug 2001 14:34 hrs chennai

Your solution and more info and lot of simmilar things from the link mentioned below.

owa_util.mime_header
===============

Syntax :owa_util.mime_header

Purpose :Enables programmer to change the default MIME
header that the Web Agent returns. This must come
before any htp.print or htp.prn calls in order to signal
the Web Agent not to use the default

Parameters:ccontent_type in varchar2

Generates:Content–type: \n\n

------------------------

http://otn.oracle.co.kr/docs/Oracle7/A34986_2.pdf

Cheers

Padmam