function popup(url,rotate) {
   winName = "extChild";
   if (!rotate) {
      width = 280;
      height = 435;
   }
   if (rotate) {
      width = 435;
      height = 295;
   }
   xPos = (self.screen.width - width) / 2 ;
   yPos = (self.screen.height - height) / 2 ;
   args = "width=" + width + "," + "height=" + height + ",location=0,menubar=0,resizable=0,scrollbars=0,";
   args = args + "status=0,titlebar=0,toolbar=0,hotkeys=0,screenx=" + xPos + ",screeny=" + yPos + ",";
   args = args + "left=" + xPos + "," + "top=" + yPos;
   extChild = window.open(url,winName,args);
   if (!extChild.closed) extChild.focus();
}