Need Help in Word Press

[adrevol]

I have two blogs installed with wordpress,

1.http://www.site1.com
2.http://www.site2.com

the Database for both of the blogs is same.
Now my problem is ..

in DB wp_options table siteurl option has got 1st blog url

so it is working fine for the first blog.

for the second blog it is getting redirected to first blog.

i know that the problem is with siteurl.
Now, how can i change the siteurl according to the host name

thanks in advance

[Marcia]

Installing multiple blogs:

[codex.wordpress.org...]