I have been working on 960 grid,(http://960.gs/) and I used an old style menu i've used in the past from a few years ago and for some reason with the 960 grid, the menu is floating left and I want it centered.

 ul#menu {
width:940px;
height:61px;
background: url(../images/menu_bg.png) no-repeat;
list-style:none;
padding-top:0;
padding-left:0;
margin: 0;
}

ul#menu li {
float:left;
}

ul#menu li a {
background: url(../images/menu_splice_color.png) no-repeat scroll top left;
display:block;
height:61px;
position:relative;
}

ul#menu li a.shel {
width:135px;
}

ul#menu li a.golf {
width:84px;
background-position:-135px 0px;
}
ul#menu li a.pro {
width:119px;
background-position:-219px 0px;
}
ul#menu li a.event {
width:94px;
background-position:-338px 0px;
}
ul#menu li a.member {
width:148px;
background-position:-432px 0px;
}
ul#menu li a.bistro {
width:91px;
background-position:-580px 0px;
}
ul#menu li a.contact {
width:115px;
background-position:-671px 0px;
}

ul#menu li a span {
    background: url(../images/menu_splice_color.png) no-repeat scroll bottom left;
    display:block;
    position:absolute;
    top:0;
    left:0px;
    height:100%;
    width:100%;
    z-index:100;
}

ul#menu li a.shel span {
background-position:0px -61px;
}

ul#menu li a.golf span {
background-position:-135px -61px;
}
ul#menu li a.pro span {
background-position:-219px -61px;
}
ul#menu li a.events span {
background-position:-338px -61px;
}
ul#menu li a.member span {
background-position:-432px -61px;
}
ul#menu li a.bistro span {
background-position:-580px -61px;
}
ul#menu li a.contact span {
background-position:-672px -61px;
}

and my generic html markup is

<div class="container_16">



    <!-- Navigation Start -->
    <div class="grid_16">
        <ul id="menu">
            <li><a href="#" class="shel"><span></span></a></li>
            <li><a href="#" class="golf"><span></span></a></li>
            <li><a href="#" class="pro"><span></span></a></li>
            <li><a href="#" class="events"><span></span></a></li>
            <li><a href="#" class="member"><span></span></a></li>
            <li><a href="#" class="bistro"><span></span></a></li>
            <li><a href="#" class="contact"><span></span></a></li>
        </ul>
    </div>
    <div class="clear"></div>

</div>

And I use jquery animations to roll over the images.

    $(function() {

    $("ul#menu span").css("opacity","0");

    $("ul#menu span").hover(function () {

        $(this).stop().animate({
            opacity: 1
        }, "slow");
    },

    function () {

        $(this).stop().animate({
            opacity: 0
        }, "slow");
    });
});