Thread: deleting images from previous postings

So on putting up some images for a post, I find a folder with previous posts' pics in it.

All now redundant but I can't find a way to select them to delete them.
In the Private message pages, at the bottom of options (left) is "Miscellaneous/attachments" but all I get to select/delete is the recent post, nothing earlier can be selected.
Viewed, yes but not select to do stuff with.

help?

ian

just post under it "now sold" or " no longer available"

thanks 199p,
I take it this kills the thread if an item for sale?
What about generic posts?