connect to internet problem

[tamer amr]

 what is the problem in these rules ? 
 
 i can't access the internet  
 
 Chain INPUT (policy DROP)
 target     prot opt source               destination
 ACCEPT     all  --  anywhere             anywhere            state RELATED,ESTABLISHED
 ACCEPT     tcp  --  anywhere             anywhere            tcp spt:http
 ACCEPT     tcp  --  anywhere             anywhere            tcp spt:imap
 ACCEPT     tcp  --  anywhere             anywhere            tcp spt:domain
 ACCEPT     tcp  --  anywhere             anywhere            tcp spt:bootps
 ACCEPT     tcp  --  anywhere             anywhere            tcp spt:https
 LOG        all  --  anywhere             anywhere            LOG level warning
 ACCEPT     tcp  --  192.168.1.0/24       anywhere            tcp dpt:smtp
 ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:smtp state NEW
 ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:ssh
 
 Chain FORWARD (policy ACCEPT)
 target     prot opt source               destination
 ACCEPT     all  --  anywhere             anywhere
 DROP       tcp  --  anywhere             anywhere            tcp spt:31337 dpt:31337
 
 Chain OUTPUT (policy DROP)
 target     prot opt source               destination
 ACCEPT     all  --  anywhere             anywhere            state NEW,RELATED,ESTABLISHE
 
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