column insert

I have to insert 2 columns into an existing database that seems to be
altered after a restore. I do not know what datatype should be entered for
"path" and for "referer". The others are int4 and timestamptz for when_stamp.
Here is the code:
/*
      * Statistics: write page view
      */
     if($loglevel>=1) {
    sqlquery("
        insert into visits (session_id,page_id,when_stamp,path,referer)
        select session_id,$page_id,'now','$REQUEST_URI','$HTTP_REFERER'
        from session
        where hash='$sid'");
     }
  Thanks for any help.
Phil Jourdan