Access my blog

I have a problem accessing my blog. I am hosting it on my home network. It is installed, everything is fine. I also have a wiki that is installed on the same server, which I can access from any computer on the network. This leads to my question.

When I am on the computer that is hosting it, to access the blog (which is titled guessswho) I type in http://localhost/guessswho and then it will bring it up. However, if I am on another computer (on the same network), when I try to access the blog, it doesn’t work. Obviously rather than localhost I type in the IP of the computer hosting it (which is a private IP because I’m behind a router). Is there some setting I need to do? Also, when I do type in the address as http://xxx.xxx.xxx.xxx/guessswho it will show a page as page not found. But when it displays that page, it has changed from http://xxx.xxx.xxx.xxx/guessswho to http://localhost/guessswho automatically (in the process of loading the blog). Any ideas? Thanks guys