persistence cookie domain

when HTTP_RESPONSE {
  if { [HTTP::cookie exists "BIGipServermy_pool"] } {  
     If the cookie does exist, let's grab the contents.
    set old_cookie [HTTP::cookie BIGipServermy_pool]
    log local0.NOTICE "OLD: $old_cookie"
     Now we delete it, then re-insert it with the domain info we want added.
    HTTP::cookie remove BIGipServermy_pool
    HTTP::cookie insert name BIGipServermy_pool value $old_cookie domain mydomain.com
    set new_cookie_domain [HTTP::cookie domain BIGipServermy_pool]
    set new_cookie [HTTP::cookie BIGipServermy_pool]
    log local0.NOTICE "NEW: $new_cookie"
    log local0.NOTICE "NEW: $new_cookie_domain"
 }
}