If I'm not mistaken, the way to do what you're trying to do, is back up the log file, then restore the old database backup with "norecovery", then restore the log file onto it.
The section in Books Online on "Restore" has detailed instructions.
Try that, see if that does what you need.
- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
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