... add this code to your <head> department:

<script type="text/javascript">
if (parent.frames.length > 0) { parent.location.href = location.href; }
When someone finds your image through Google Images, it "kills" the frame and shows your website. I have added it to one of my sites, and the number of visitors DOUBLED already.

I think that Shenron mentioned this a while ago, and he's using it on his sites. I bet he can confirm the impact of this little piece of code on the traffic.