Only pull up web site by using nameserver ip

[optimised]

Hi,
I'm using r/h 7.1 bind 9.1. I've only been able to access my web page by using my dns ip address in address bar in browser.
Would this be a problem with my zone file for my domain?

these are my conf files:

// named.conf - configuration for bind
options {
directory "/var/named/";
};
key rndc_key {
algorithm hmac-md5;
secret "WpmzrVa55MEzL10swxsBVg==";
};

controls {inet 172.25.47.98 port 953 allow {localhost;} keys {rndc_key;};
};
zone "." {
type hint;
file "named.ca";
};
zone "0.0.127.in-addr.arpa" {
type master;
file "0.0.127.in-addr.arpa.zone";
};
zone "localhost" {
type master;
file "localhost.zone";
};
zone "www.mydomain.com" {
type master;
file "www.mydomain.com.zone";
};

// localhost.zone
$TTL 86400
@ IN SOA @ root.localhost (
1 ; serial
28800 ; refresh
7200 ; retry
604800 ; expire
86400 ; ttl
)

@ IN NS localhost.
@ IN A 127.0.0.1

// www.mydomain.com.zone (http://www.mydomain.com.zone)
$TTL 86400
@ IN SOA @ root.localhost (
3 ; serial
28800 ; refresh
7200 ; retry
604800 ; expire
86400 ; ttl
)
@ IN NS ns1.mydomain.com
@ IN NS ns2.mydomain.com
@ IN MX 20 myhostman.com

//httpd vhost section
NameVirtualHost 172.25.47.98
<VirtualHost 172.25.47.98>
Servername www.mydomain.com (http://www.mydomain.com)
DocumentRoot /home/domain/www
</VirtualHost>