Framing web pages

[Jonathan Hutchins]

I have a client who is concerned that there are other web sites that are 
taking his content and placing it within frames on their web site as if it 
were their own.  I know I've seen this happen, and I think I've seen "click 
here if someone has this site framed" buttons or some such.  Does anyone know 
of a way to prevent the pages from being grabbed in a frame to begin with?