In the backoffice there is a setting for the base url of your blog. Does that have localhost in it? If so, you might change the localhost part to the network ip address of your host server. 128.0.0.xxx or something like that.

In the backoffice you should also make sure you have set a default skin for your blog. The default skin from your settings is what will appear to outsiders.

Your Xammp settings should be fine since you can access the blog okay on your network.

so this means that everytime i add a new blog, i have to set it manually?

the skin thing doesnt change. it still look plain..

erm.. it works, but when i click at the "login" link. it is still redirect to "localhost"

and i noticed, i didnt have that "/admin" folder. im using "serenity" 1.8.2

and

in "/conf/_config.php" theres no statement such as
"$baseurl = 'http://localhost';" and if i wanted to, wwhere should i put it?

anyone please....

I think it was moved from _config.php to _basic_config.php or something like that in the same /conf folder.

yes, heman, you probably have your $baseurl set to "localhost". Change that in the /conf/_basic_config.php file.