function NewCenterWindow(URL,_width,_height) {
  yes = 1;
  no = 0;
  winName = '';

  _fullscreen = yes;
  _toolbar = no;
  _location = no;
  _directories = no;
  _menubar = no;
  _status = no;
  _scrolling = no;
  _scrollbars = no;
  _resizable = no;

  _top = screen.availHeight;
  _left = screen.availWidth;

  _top = (_top-_height)/2;
  _left = (_left-_width)/2;

  _features = "'fullscreen=" + _fullscreen + ",toolbar=" + _toolbar + ",location=" + _location + ",directories=" + _directories + ",menubar=" + _menubar + ",status=" + _status + ",scrolling=" + _scrolling + ",scrollbars=" + _scrollbars + ",resizable=" + _resizable + ",width=" + _width + ",height=" + _height + ",top=" + _top + ",left=" + _left + "'";
  window.open(URL,winName,_features);
}