getting Flash to play mp3

Thanks to all who helped with an earlier sound question. I decided to go with a Flash controller with Lectora passing a variable with the corresponding mp3 name. The problem, after passing the variable, flash doesn't play the file. Flash does play the file if I hardcode the file name in Flash, eg.myPlayback.contentPath = "cid01.mp3";I'm passing the variable with this line:myPlayback.contentPath = getURL("javascript:window.document.swfanim51.SetVariable('my Sound', VarmySound.getValue())");I've also tried variations adding quotes around the getURL function, etc. but with no luck. I can see that the variable updates in a text field, but still the audio does not play.Am I wrong to assume that Flash will update/play with the new variable? any help is appreciated.cheers,Mark