frametarget = 0;
f = typeof parent.parent.parent.frames["index_target1"];
if((f == "undefined") || (f == "null") || (f == "")) {
  try_again();
  write_target();
}
else {
  basetarget = "_self";
  write_target();
}   

function try_again() {
  f = typeof parent.frames[0];
  if((f == "undefined") || (f == "null") || (f == "")) {
    frametarget = 2;
    basetarget = "_top";
  }
  else {
    f = typeof parent.parent.frames["index_main_target2"];
    if((f == "undefined") || (f == "null") || (f == "")) {frametarget = 2;}
    else {frametarget = 1;}
    basetarget = "_self";
  }
}
  
function write_target() {
  target = "<base target=" + (basetarget) + ">";
  document.write(target);
}