First you are going to have to detach the db using <b>sp_detach_db</b>. Then move the log to the new location and use <b>sp_attach_db</b>.
The easiest way to do this is to open up SQL Query Analyzer and run these procedures. Look up on technet.com and/or MSDN for a description on how to use these procs.
Thanks,
Anthony Mendoza, Jr., MCSD, MCDBA
Micro-Systems, Inc.
Application Developer