function findFrame(w,nm){ 
     var win=w;
     var name=nm;
     if (win.frames && win.frames.length){
           for(var i=0;i<win.frames.length;++i){
                if(win.frames[i].name==nm) return win.frames[i];
                var _result= findFrame(win.frames[i], name);
		if(_result) return _result;
           }
     }
     return null;
} 
 function launchAudio(){  
   var frame= findFrame(top,"MainContent3");
   if(frame) frame.location.href="audio.html";
 }
 function exitAudio(){  
    var frame= findFrame(top,"MainContent3");
    if(frame) frame.location.href="splash_bottom.html";
 }