Codeking'in söylediğine ek olarak örnekleyeyim;
<?php
$mp3url = 'mp3 id';
?>
<script type="text/javascript">
<!--
var object = new SWFObject("mediaplayer.swf", "mediaplayer", "900", "20", "7");
object.addParam("allowfullscreen", "true");
object.addVariable("width", "900");
object.addVariable("height", "20");
object.addVariable("autostart", "true");
object.addVariable("file", encodeURIComponent("http://www.vidipo.com/yurut/<?=$mp3url;?>.flv"));
object.addVariable("type", "flv");
object.addVariable('backcolor','0x000000');
object.addVariable('frontcolor','0x808080');
object.addVariable('lightcolor','0xCCCCCC');
object.write("flashplayer");
-->
</script>