function isIe(){return ((navigator.userAgent+"").toLowerCase()).indexOf("msie")!=-1;}

function canPlaySound(){
var mimeType = "application/x-mplayer2"; //default
var agt=navigator.userAgent.toLowerCase();
if (navigator.mimeTypes && agt.indexOf("windows")==-1) {
//non-IE, no-Windows
  var plugin=navigator.mimeTypes["audio/mpeg"].enabledPlugin;
  if (plugin) mimeType="audio/mpeg" //Mac/Safari & Linux/FFox
}//end no-Windows
return (mimeType != "");
}//end function getMimeType

function writeSound(soundUrl) {
	if (canPlaySound())	{
		if (isIe()) {
			if (top.focused) {
				document.write("<BGSOUND id='BGSOUND_ID' LOOP=1 SRC='" + soundUrl + "'>");
			} else {
				document.write("<embed name=e_sound src='" + soundUrl + "' height=0 width=0 type='application/x-mplayer2' autostart=true loop=0>");
			}
		} else {
			document.write("<embed src='" + soundUrl + "' height=0 width=0 type='application/x-mplayer2' autostart=true loop=0>");
		}
	}
}

function getRnd() {
	var rd = (Math.random()+"");
	return rd.substring(rd.indexOf(".")+1,8);
}