Can I prevent pinging from others and still can ping others?

[linux_netfilter]

hi,all
   I have a question about 'ping' work with netfilter.How can I 
ban the icmp echo message out and still can send icmp request message
out and can recieve the icmp echo message at the same time.e.g.
I wish I can ping other computer which don't ban icmp echo,but I
also want my computer can't respond the 'ping' from others.I use
iptables.can I?
    Thanks in Advance.



            linux_netfilter
            linux_netfilter@sina.com