Problem with the mp3 file

Please I have this code

<action name="playbackgroundsound">if(%1 == none,stopallsounds();set(plugin[soundinterface].background,%1),if(plugin[soundinterface].background == %1,,stopallsounds();playsound(auto,%1,%2);set(plugin[soundinterface].background,%1)));</action>
<plugin name="soundinterface"
url="soundinterface.swf"
keep="true"
preload="true"
/>
<events onloadcomplete="playbackgroundsound(som1.mp3,0);"
onloadcomplete="removeplugin(swffile);" />
When I take out the (remove plugin for swf) the mp3 work but the swf file (loading bar) still stay on the pano, and when I remove the playback event the remove swf work.
What is wrong?

Please One more question. If I have 2 panoramas and one I want to put backgroundsound and the other no. What I have to do?

Thank you.

Thank you everybody I got the exit. I will convert my mp3 to swf.

Thanks to all.