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#navigation {    
    text-align:center;
}

ul#main-nav {
    float:none;
    display:inline-block;
}

* html ul#main-nav { /* Target IE6 */
    display:inline;
}
*+html ul#main-nav { /* Target IE7 */
    display:inline;
}

ul#main-nav li {
    display:inline;
}