var opened, openWindow
opened = false
function doPop(h,w,f,t){
  hmax = 520
  wmax = 912
  if (opened){
    if (!openWindow.closed) openWindow.close()
  }
  if (h>hmax){
    h=hmax
    t='yes'
  }
  if (w>wmax){
    w=wmax
    t='yes'
  }
  openWindow = window.open(f,"popup001","height="+h+",width="+w+",resizable=no,scrollbars="+t+", toolbar=no,location=no,directories=no,status=no,menubar=no,copyhistory=no")
  opened = true
}