Passing dynamic value into HTML from webforms

We're setting up an imaging application on the web, and I need the ability to read an image path from the database with forms (or a stored PL/SQL procedure I can call from forms), and have that open an HTML file in a web browser and pass it the name of the file I need opened. The HTML file is mostly static, but needs to accept the filename parameter at runtime.

For our application, we're using an image viewer called Spicer Image a.X 7.20 for the web.
What I had to do was build a procedure named web_image in pl/sql to be called from a webform with web.show_document('server/pls/portal30/web_image?filename_in='||<oracle_file_id>,'_blank')
That call worked just fine and I get a new instance of the web browser with the HTML I set up in my web_image procedure.
Here's the procedure.
create or replace procedure web_image(filename_in varchar) as
begin
htp.p('<HTML>');
htp.p('<HEAD>');
htp.p('<TITLE>AEC Web Image Integration</TITLE>');
htp.p('</HEAD> ');
htp.p(' <BODY>');
htp.p('');
htp.p('<OBJECT');
htp.p(' CLASSID="clsid:1120C1B3-8768-11D1-8108-020701190C00"');
htp.p(' ID="SpicerViewControl"');
htp.p(' ALIGN="center" WIDTH="800" HEIGHT="500" BORDER="0" VSPACE="0" HSPACE="0">');
htp.p('</OBJECT> ');
htp.p('');
htp.p('<OBJECT');
htp.p(' CLASSID="clsid:895CDC65-8837-11D1-8109-020701190C00"');
htp.p(' ID="SpicerDocumentControl"');
htp.p(' ALIGN="center" WIDTH="1" HEIGHT="1" BORDER="0" VSPACE="0" HSPACE="0">');
htp.p('</OBJECT> ');
htp.p('');
htp.p('<SCRIPT LANGUAGE="JavaScript">');
htp.p('  ');
htp.p(' </SCRIPT>');
htp.p(' </BODY>');
htp.p(' </HTML>');
end;

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