// func: pop_window(u)
function pop_window(u)
{
  var f = 'fullscreen=no,toolbar=yes,status=no,menubar=yes,scrollbars=yes,resizable=yes,directories=no,location=yes,width=800,height=600,left=20,top=20';
  var n = 'imperium_pop';
  var w = window.open(u,n,f);
  if (w) {
    w.focus();
  }
}