Flash embed techniques from Adobe, A List Apart, and YouTube.

noembed

1. If Flash is available and enabled,
2. this line will be missing, because
3. noembed elements are suppressed,
4. and line 2 is in a noembed.

plain embed

object type= (non-IE)

alternate content

object classid= (IE)

alternate content

object-embed (twice-cooked)

object-object (with conditional comments)

alternate content

YouTube embed code