I've never liked ratings much, so I don't enable them on my images nor do I rate others' images. I always appreciate crits (if done nicely), although I might disagree and leave the image as it is. Giving crits is always a bit risky, unless you know the person well. I'm sure some of my work is shit and not up to par with my better work, and I wouldn't mind if this was pointed out to me, if not in a form of a comment, at least in an IM. Doug