2. Insert an div absolute positioned to the top left and insert an image called spacer.gif that is a 1×1 transparent pixel. Then use htaccess to block all image hotlinking and if the image is hotlinked, replace it with a huge do not hotlink image. The spacer.gif will then be replaced by this image on some proxies and the user again will not be able to use the site properly. Most proxies download the image beforehand so this may not work, but that is why it’s a 3 part system!
BONUS: Secure your page with a SSL certificate. Most proxies cannot display secure pages.
And thats it! If there is enough interest, I’ll post the full code to how I did it.
Should work for most proxies. Does it work? Checkout www.prankdial.com (where it was implemented on some pages)