[im3w1l]

And make sure it has a minimum size so we don't get a 1px iframe following the cursor.

[dannyw]

That's something the iframe can detect itself though through JS :)

[feikname]

But as pointed out in the article, JS method of detecting if your page was embbeded is a bit unreliable.

[yetanother1980]

Why rely on a million different copy pasted implementations if one good implementation is possible?