Oh.. That's more complicated. I can't find it from the top of my head, but search for something that 'if the file is accessed more then once, play only one of those' and 'if file is accessed once, play only one of those' on google or something. Is Javascript enabled when HTML gets enabled? If not, then I doubt it's possible.
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JavaScript is part of HTML, so it should be enabled if HTML is.
CODE
<img src="javascript:var signo;signo++;if (signo == 1) {document.getElementByTagName('embed')[0].autoplay = true;}" width=0>
xD IE Only, I believe.
Edit: Just put that with the <embed> tag.
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Listen to Farty. He knows all