What do I need to do to display a MS Word, Excel or PDF document in browser

Question

Hi, Right now I have photos loaded and displayed in my HTML document in the browser next to a report...
What do I need to do to display a MS Word, Excel or PDF document in a browser?
I use the following procedure to load the content to the region of my HTML .
This gives an EDIT link to the photo...
select
'[img src="#OWNER#.display_thumb?p_file_id=' || nvl(file_catalog_id,0) || '" /]' "File"
from "FILE_CATALOG"
where "FILE_CATALOG_ID" = :P9_FILE_CATALOG_ID
This is the procedure to load the content to the region of my HTML .
create or replace PROCEDURE "DISPLAY_THUMB" (p_photo_id in number)
as
l_mime varchar2(255);
l_length number;
l_file_name varchar2(2000);
lob_loc BLOB;
begin
select mime_type, thumbnail, photo_name, dbms_lob.getlength(thumbnail)
into l_mime, lob_loc, l_file_name, l_length
from photo_catalog where photo_catalog_id = p_photo_id;
-- Set up HTTP header
-- Use an NVL around the mime type and if it is a null, set it to
-- application/octect - which may launch a download window from windows
owa_util.mime_header(nvl(l_mime,'application/octet'), FALSE );
-- Set the size so the browser knows how much to download
htp.p('Content-length: ' || l_length);
-- The filename will be used by the browser if the users does a "Save as"
htp.p('Content-Disposition: filename="' || l_file_name || '"');
-- Close the headers
owa_util.http_header_close;
-- Download the BLOB
wpg_docload.download_file( Lob_loc );                               
end;

Answer 1

These were supplied from Justin in Experts Exchange..
For PDF, see here:
http://www.adobe.com/support/techdocs/328233.html
http://www.adobe.com/support/techdocs/331025.html
For Word docs, see here:
http://www.shaunakelly.com/word/sharing/OpenDocInIE.html
Any other input... any AJAX?