Screen sizes problem?

[Buffy1011]

Hi people. I'm new to this forums, and I need a little bit of help with making my site's homepage fit for all screensizes..
So I coded a layout to fit my computer, which is a Netbiook. One of my friends tested the site and set it was totally off for him because of the different screen sizes.
I want to be able to make it viewed as the same site for all different screen sizes of computers (not mobile, though). Is that possible? What should I do?
If anyone needs more info just ask..as I said, I'm new to these forums so I'm not sure what to include in my post.
Thanks!

[SB65]

Essentially you have two choices. You can make your site fluid so it will expand or contract to take up the available width of the screen - Coding Forums itself does this. Or you can set a fixed width to the site taking into consideration the range of screen widths - the de facto standard is to fit the width of 1024px screens - like, for example, the BBC News site which has a width of 976px.

If you post a link to your page it may be possible to offer more specific advice.

[Buffy1011]

Sorry for the late reply but the link is here.

[SB65]

I'd start by removing this width which is giving the enormous horizontal scroll:

#topbar {
    background-color: #09C405;
    border-top-left-radius: 20px;
    border-top-right-radius: 20px;
    height: 5px;
    padding: 10px;
    width: 990%;
}