Additional Image Field for HTML

[plz_help_me]

Hello.

How do I add an additional image field that allows html, just like the current description field? When I try I get this error message:
Not Acceptable

An appropriate representation of the requested resource /shop/admin/images.php could not be found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

I have tried text, textarea, varchar. I have searched the forums for an answer.

Please help me.
-plz_help_me

[.Infecto]

Search in details.php
$image_name = format_text($image_row['image_name'], 2);
Add after:
$image_YOURFIELD = format_text($image_row['image_YOURFIELD'], 2);

Search:
"clickstream" => $clickstream,
Add after:
"image_YOURFIELD_html" => $image_YOURFIELD,

Open details.html
Add
{image_YOURFIELD_html}