How to identify if a webpage is being loaded inside an iframe or directly into the browser window?

Question

I am writing an iframe based facebook app. Now I want to use the same html page to render the normal website as well as the canvas page within facebook. I want to know if I

Answer 1

I'm not sure how this example works for older Web browsers but I use this for IE, Firefox and Chrome without an issue:

var iFrameDetection = (window === window.parent) ? false : true;