replacing images with alt attribute text

Hi,

I want to replace an image in an XHTML document with the associated alt text.
Since

img {
  content: attr(alt)
}

is no legal CSS2, I thougt something like

img {
  display: none;
}

img:before {
  content: attr(alt);
  display: inline;
}

should to the trick. Is this the right way or isn't this possible at all?

regards,
--
Björn Höhrmann ^ mailto:bjoern@hoehrmann.de ^ http://www.bjoernsworld.de
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