var pop = null;

function openwindows()
{
pop = window.open("popup.htm","DGB-SACHSEN","width=450,height=331,resizable=0,scrollbars=0,menubar=0,toolbar=0,location=0,status=0");
}

function popdown() {
  if (pop && !pop.closed) pop.close();
}


window.onunload = popdown;
window.onfocus = popdown;