javascript / IE 6/7: check if within an iframe

Question

I have a page which needs to check whether it is contained within an iframe or not in effect whether the page is the top page.

I tried doing this: if(window == window.parent) and it works for Opera, FF, and Chrome but not for IE. is there some trick in IE I should use?

Answer 1

if (top != self)
{
    // I'm in an iframe
}