Images are annoying because you can't copy and paste the address. I would suggest http://www.albionresearch.com/misc/obfuscator.php it's not perfect, but it's the best you can do and still allow clicking the address, and not use javascript.

While this seems like a nice, little tool, I find (as already mentioned in this thread) obfuscating emails a pointless endeavour.

In the end you will need a spam-filter anyway.