odd relative path behaviour

[eluser]jedd[/eluser]
[quote author="neomech" date="1252136926"]
I could try the html helper class, although I'd still like to know what's causing this odd behaviour.
[/quote]

If you do the first part of that sentence, and the problem goes away, you'll have answered the second part.

IOW you're experiencing the joy of routes and the way CI pipes everything through index.php (no matter what the URL suggests) and consequently life just becomes much simpler once you let CI handle pathing. Eg. by using img().