var SoundPath='img/sound.mid';
var MSIE=navigator.userAgent.indexOf("MSIE");
var NETS=navigator.userAgent.indexOf("Netscape");
var OPER=navigator.userAgent.indexOf("Opera");

if ((MSIE>-1) || (OPER>-1))
 { document.write('<bgsound src="' + SoundPath + '" volume="100" loop="infinite" id="soundsrc">'); } else
 { document.write('<embed src="' + SoundPath + '" autostart="true" hidden="true" volume="100" loop="true" name="soundsrc">'); }

function PlaySound() { document.all['soundsrc'].src=SoundPath; }
function StopSound() { document.all['soundsrc'].src=''; }
function PlayStopSound() { if (document.all['soundsrc'].src==SoundPath) { StopSound() } else { PlaySound() } }