im puzzled

i though "frameborder" was an attribute of <frameset> tags...  it says
so in my book....  why will the validator still give me an error?  and
another thing...  my server, http://www.geocities.com inserts a
javascript "watermark" that generates another 2 errors and they're not
even my fault... how do i over come these errors?  thanks for your
time.  any help would greatly be appreciated... thank you,
ronnie