How to show image URL in Node Editing page?

I'd like the user to be able to see the image URL after it is uploaded (but before the node is saved) so that he can copy that URL and paste it into the body of the node (or in a dialog box of a WYSIWYG editor which would handle the correct HTML code to display the image in the body).

I know I can set 'Display Fields' to show the path or URL to file, but it is showed only when viewing the saved node, not while editing it, so this would not work for me.

What I'm looking for is similar to what the Upload module does: show the path in the editing page before node is saved. The D7 version of imagefield also does something similar, showing a link to the file while still in editing mode. But in D6 all I see is the thumbnail and the checkbox for 'List'. Changing the display options does not affect the way the field is displayed in editing form.