Align Navigation to the center

Hello I would like to center the navigation menu. I believe I found the spot to change it, but having issues from grabbing bits of code from the forums and adjusting. Could someone tell me where I need to adjust? Thank you.

#nav ul, #subnav ul {
    background-attachment: scroll;
    background-clip: border-box;
    background-color: transparent;
    background-image: url("images/riptop.png");
    background-origin: padding-box;
    background-position: 0 0;
    background-repeat: repeat;
    background-size: auto auto;
    height: 85px;
    list-style-image: none;
    list-style-type: none;
    margin-bottom: 0;
    margin-left: 0;
    margin-right: 0;
    margin-top: 0;
    padding-bottom: 0;
    padding-left: 0;
    padding-right: 0;
    padding-top: 0;
    width: 955px;
}

http://tinyurl.com/848r8op

Thanks for the assistance!