How to update perl5?

From: Le Sandy Sun (Sandy.Sun_at_Sun.COM)
Date: 08/07/04 

Date: Sat, 07 Aug 2004 17:29:34 +0800
To: beginners@perl.org

Well,there are two perl5 in my solairs mechine.
The defualt is perl5,v5.003 and another is perl5,v5.6.1
My question is how can I change the defualt perl5 from v5.003 to v5.6.1?