How do I use Iptables to redirect URL

["shaofeng" <shaofeng.wu@xxxxxxxxx>]

When somebody connect to host A and the URL is
"http://www.A.com/A.htm";.
I want to redirect to the request to host B and change the URL as
"http://www.B.org/B.htm";
How do I set the iptables rule.

,Shaofeng