Attachments are pesky little things, aren't they?! I've edited them out for you this time to tidy up your thread, though as many of the images were duplicates of the ones you wanted removed it also wiped a couple of your headers, so they'll need to be re-uploaded. For future reference, you can manage and delete attachments by clicking "Edit Post", choosing "Go Advanced", then scrolling down to the Additional Options box where you'll see a column for Attachments. Click "Manage Attachments", and you can choose the images you wish to delete from the pop-up box. I'd also highly recommend uploading your images to a site like
imgur.com and inserting the links rather than using the site uploader, as it's really just a bad system.
It's a bit more complicated than it needs to be!