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I did search the net, but the information I found did not work or was too fragmented.
thanks in advance Sabine
embed and various attributes are not part of any official specification. You can use Javascript to write out the markup, but you would only be fooling the validator into not parsing the invalid markup - it is just hiding the problem, not solving it. So the stark choice is between having a page which validates or a page which works cross-browser. I would strongly recommend putting your users first and putting up with the very minor validation problem.
It embeds quicktime movies with valid xhtml.
You only need to change the classid and the mime type to match mp3.