var menu = new Array;
menu[0] = "menuBase";
menu[1] = "menuAdvance";
menu[2] = "menuLinian";
menu[3] = "menuReading";
menu[4] = "menuWriting";
menu[5] = "menuWarmup";

function showMenu(n){
	var obj = eval(menu[n]);
	
	if(obj.style.visibility=="visible") return;

	obj.style.visibility="visible";

	for (i=0;i<3;i++){
		mObj = eval(menu[i]);
		if (i!=n) mObj.style.visibility="hidden";
}}

function hideMenu(n) {
	var obj = eval(menu[n]);
	obj.style.visibility="hidden";
}


//===================================
function bgMusicFileName()
{
	return "bgmusic/bg"+parseInt(Math.random()*4)+".mp3";
}
function iniMusic()
{
	var filename = bgMusicFileName();
	if(fileName!="")
		APlayer.URL = filename;
}
var spkrStatus=0;
function audio(filename)
{		
		APlay.Controls.stop();	
		var strUrl = APlay.URL.toString();
		var strSubUrl="audio";
		var strFile = "";
		var intValue = parseInt(strUrl.lastIndexOf(strSubUrl));
		if(strUrl.lastIndexOf(strSubUrl)>-1)
		{
			strFile=strUrl.substring(strUrl.lastIndexOf(strSubUrl)+6,strUrl.length);
		}
		 if(spkrStatus==1 && strFile==filename)
		{			
			spkrStatus=0
			APlay.settings.volume=2;
			bgAudio();
		}
		else{
			APlay.URL="audio/" + filename;
			APlay.settings.volume=98;	
			bigspkr.src="../images/bigspkr_2.gif";
			spkrStatus=1;
			//alert(bigspkr.src);
		}
}
function bgAudio()
{	
	APlay.Controls.stop();
	APlay.settings.volume=2;	
	if(document.all.bigspkr!=null)bigspkr.src="../images/bigspkr.gif";
	setTimeout("APlay.URL='"+bgMusicFileName()+"';",200);
}
//==========================
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}
function MM_reloadPage(init) {  //reloads the window if Nav4 resized
  if (init==true) with (navigator) {if ((appName=="Netscape")&&(parseInt(appVersion)==4)) {
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);

function MM_showHideLayers() { //v6.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}