can you post a link to your forum?
What version of the forum are you using?
if you are using v3.1 sr4 then in the code that you added to inc_top.asp you should have the following:
' ******************************************************
' ADD HERE WHAT YOU WANT THE PREFIX OF YOUR COOKIE TO BE
' it will either be 'strCookieURL' or 'strUniqueID'
strTempCookieType = strUniqueID
' ******************************************************
if you are using an older version like v3.1 sr2 then strTempCookieType should be set to strCookieURL