image copying

At the top of each of my pages, I put

<META HTTP-EQUIV="imagetoolbar" CONTENT="no">

to keep people from being able to right click on one of my images and save it. But from site reports I can see that people are copying images that are in the embedded views I'm sticking on my site.

But I'm not aware of anything I can stick in an iframe to perform that same function. If the script given to me for an iframe to embed in my page consists of an HTML page, can you stick that Meta Tag in the page header?

Thanx
maureenshea