log file to be reduced

Hi All
I have a mdf file of around 4gb but log file increased to
20gb. how to reduce size of log file.
Any help would be highly appreciated.
Rgds
TriveniHave a look at these articles
INF: How to Shrink the SQL Server 7.0 Transaction Lo
http://support.microsoft.com/default.aspx?scid=kb;en-us;25665
INF: Shrinking the Transaction Log in SQL Server 2000 with DBCC SHRINKFIL
http://support.microsoft.com/default.aspx?scid=kb;en-us;27231
http://www.mssqlserver.com/faq/logs-shrinklog.as
Hope this help
John