To have more than one extra header file You can do like this in the "podvars.pm" file.

if ($pod_dir =~ "Spears,_Britney")
{
open (READIT, "$pod_templatedir/britney.html");
}
elsif ($pod_dir =~ "Madonna")
{
open (READIT, "$pod_templatedir/madonna.html");
}
elsif (($pod_dir =~ "Music") or ($pod_dir =~ "Musik"))
{
open (READIT, "$pod_templatedir/music.html");
}
else
{
open (READIT, "$pod_templatedir/header.html");
}

I hope this helps.
kindly
/BeRKA