creating fixed width with 960?

i use 24 columns fluid version of 960. the html looks like this:

<body>
    <div class="container_24">
        <div id="header" class="grid_24">
            Welcome to my page
        </div>

        <div id="leftbar" class="grid_4">
            leftbar
        </div>
        <div id="content" class="grid_12">
            content
        </div>
        <div id="rightbar" class="grid_4">
            rightbar
        </div>
        <div id="ads" class="grid_4">
            ads
        </div>

        <div id="footer" class="grid_24">
            Footer
        </div>        
    </div>
</body>

i wonder how i can make the leftbar, rightbar and ads divs fixed width so that they dont get thinner when i resize the webbrowser to a smaller size. i want just the header, content and footer div to be fluid.

is this possible?

ansaurus

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creating fixed width with 960?

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