As a page, can I tell if I've been loaded into an iframe using javascript?

Question

I'm loading a page into an iframe. Both pages are on the same domain. I want the page being loaded to do specific js functionality only if it has been loaded into an iframe. Is this possible?

Bonus: can it be done in jQuery?

Thanks

Answer 1

or just:

var isEmbed = window != window.parent; 

Answer 2

Probably the simplest method:

if ( self !== top ) {
    // you're in an iframe
}

So, you check if the current window is the topmost window...