Tutorial Image linking

This isn't so much of an issue, but a question.

If I end up writing more tutorials can I hand type the reference link to an image. I would prefer to do this rather than "upload" an image. That way if I end up improving a tutorial and change some images. i won't be using up SCIRRA's own hard drives.

Just a little while ago(1hour) I started updating the touch controller tutorial I put up a month ago. I replaced every image. Now I'm concerned that the old images(and a couple images uploaded more than once) are just going to go to waste.

We prefer to host images ourselves because if over time (think years) people's own hosts go down or they forget about it and clean up their files deleting everything, we don't end up with tutorials full of broken images.