Never, never, never, never detach a corrupt or suspect database. It will not help and it is very likely to make matters far worse.
Take a look at this article. http://www.sqlservercentral.com/articles/65804/
As for the DB with the corrupted log, if you have a good backup, restore it. If the DB is in full recovery and you have scheduled log you'll be able to restore with minimal data loss.
If you don't have a backup, you're in a world of hurt... I hope that's not the case.
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
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