var newWindow = null;

function NewTune(num) {
  closeWindow(); 

  if (num==1) {
    newWindow = open("Audio/mgjb_demo1.php?trk=0","myWindow","height=550,width=440,left=300,top=200");
  }    
  else if (num==2) {
    newWindow = open("Audio/mgjb_demo1.php?trk=1","myWindow","height=550,width=440,left=300,top=200");
  }
  else if (num==3) {
    newWindow = open("Audio/mgjb_demo1.php?trk=2","myWindow","height=550,width=440,left=300,top=200");
  }
  else if (num==4) {
    newWindow = open("Audio/mgjb_demo1.php?trk=3","myWindow","height=550,width=440,left=300,top=200");
  }
  else if (num==5) {
    newWindow = open("Audio/mgjb_demo1.php?trk=4","myWindow","height=550,width=440,left=300,top=200");
  }
  else if (num==6) {
    newWindow = open("Audio/mgjb_demo1.php?trk=5","myWindow","height=550,width=440,left=300,top=200");
  }
  else if (num==7) {
    newWindow = open("Audio/mgjb_demo1.php?trk=6","myWindow","height=550,width=440,left=300,top=200");
  }
   newWindow.focus();
}


function Fid() {
  closeWindow(); 
  newWindow = open("fidelity.html","myWindow","height=300,width=520,left=300,top=150,scrollbars,resizable");
}


function closeWindow() {
  if (newWindow != null) {
    newWindow.close();
    newWindow = null;
  }
}