Accumulating snapshot folder

Hi all,
I found that my testing server is accumulating shapshot folder in repldata. Everytime, we refresh the tables (snapshot publication), a new folder created without the old folders. And I found that there is at most 1 snapshot folder remain in production server. Any parameter to adjust the retention period of the snapshot folder? Thanks in advanceWhat version of SQL Server are you using?|||MSSQL2005 SP2|||Retention setting can be adjusted in publication property.