One domain name - 2 servers

[bind at col7.metta.lk]

Hi all,

When I do a nslookup on yahoo.com I get several ip's.
How do I set up that kind of thing.

I have 2 servers with our website on

dhamma.metta.lk
sati.metta.lk

I want both sites to be found if you do a lookup on
www.metta.lk or metta.lk

my zone file of metta.lk is below

thanks in advance.

Mettavihari
------------------------
$TTL            86400
@               IN      SOA
dhamma.metta.lk.        root.dhamma.metta.lk. (
                        2003021401 ; serial
                        3600 ; refresh
                        900 ; retry
                        1209600 ; expire
                        43200 ; default_ttl
                        )
@               IN      NS      dhamma.metta.lk.
@               IN      NS      ns1.secondary.com.
@               IN      NS      ns2.secondary.com.
@               IN      A       203.115.29.130
@               IN      A       203.115.29.146
@               IN      MX      10      mail.metta.lk.
dhamma          IN      A       203.115.29.130
dhamma          IN      MX      10      dhamma.metta.lk.
www             IN      CNAME   dhamma.metta.lk.
WWW             IN      CNAME   dhamma.metta.lk.
mail            IN      A       203.115.29.139
mail            IN      MX      10      mail.metta.lk.
sati            IN      A       203.115.29.146
sati            IN      MX      10      sati.metta.lk.
col7            IN      A       203.115.29.130
col7            IN      MX      10      dhamma.metta.lk.
nc              IN      A       203.115.29.130
nc              IN      MX      10      dhamma.metta.lk.
col4            IN      A       203.115.29.130
col4            IN      MX      10      dhamma.metta.lk.
narada.col7             IN      A       203.115.29.130
narada.col7             IN      MX      10      dhamma.metta.lk.
vajira.col4             IN      A       203.115.29.130
vajira.col4             IN      MX      10      dhamma.metta.lk.
modem01         IN      A       10.0.0.1
daya            IN      A       203.115.29.130
sati.bps                IN      A       203.115.29.130
sati.bps                IN      MX      10      dhamma.metta.lk.
mail1.bps               IN      A       203.115.29.130
mail1.bps               IN      MX      10      dhamma.metta.lk.
bps             IN      A       203.115.29.130
bps             IN      MX      10      dhamma.metta.lk.
sobhana         IN      A       203.115.29.130

-- 
A saying of the Buddha from http://metta.lk/ 
Though little he recites the Sacred Texts, but acts in accordance with the teaching, forsaking lust, hatred and ignorance, truly knowing, with mind well freed, clinging to naught here and hereafter, he shares the fruits of the Holy life. 
Random Dhammapada Verse 20