win = false

function openWin(src,winname,attributes) {
if (win && win.open && !win.closed) {
win = window.open(src,winname,attributes);
win.focus();
return false;
}
else {
  win = window.open(src,winname,attributes);
  return false;
}
}


function closeWin() {
if (win && win.open && !win.closed) {
win.close();
}
else {
return false;
}
}