How to centre a horizontal menu? Nothing seems to be working!

/* ---------- ONLY EDIT BELOW THIS LINE ---------- */
body {
	font-size: 11.5px;
	font-family: Helvetica, sans-serif;
	background: #fff;
	color: #000;
	line-height: 10em;
}

/* the general link scheme */
/* 'index' links are governed further down the file - #index */
a:link { text-decoration: none; color: #000; }
a:active { text-decoration: none; color: #00cc00; }
a:visited { text-decoration: none; color: #999; }
a:hover { text-decoration: underline; }
a img { border: none; }

.clL { clear: left; }

/* this is to prevent some background colors on links in exhibits */
/* maybe this is no longer necessary */
#img-container span.backgrounded a,
#img-container a.thickbox, 
#img-container a.thumb-img, 
#img-container #d-col1 a { background: transparent; }

#index {
width: 100%;
	z-index: 2;
	position: fixed;
	top: 0;
	left: 0;
        center: 0;
	background: #fff;
	overflow: visible;
	height: 90px; /* adjust this if needed */  
}

/* PRE NAV TEXT - Name Of The Site / Your Logo - Can be accessed in the Exhibit Settings */
#index .top-section
{
	text-align: right;
	position: fixed;
	z-index: 1;
	right: 40px;
	top: 25px;
	width: 
}
/* END PRE NAV STYLING */
/* STYLING THE INDEX - via #index */
/* all menu parts */
#index nav {  }
#index ul {
    display: inline-block;
    float: left;
    list-style-type: none;
    margin: 0 auto;
    overflow: visible;
    width: auto;
    text-align: center;
  
}

#index ul.section {
    margin: 0px 10px 2px 0;
}
/*#index ul.section ul { margin-bottom: 9px; }
#index ul.section ul ul.subsection { margin-bottom: 0px; } */

/* styles for the section titles */
#index ul.section span.section_title, 
#index ul.section span.section_title a 
{ text-decoration: none; cursor: pointer; font-weight: bold; text-align: left; width: auto; }
#index ul.section span.section_title:hover, #index ul.section span.section_title a:hover 
{ text-decoration: underline; }

/* active section titles */
#index ul.active_section { }

/* sub-section titles */
#index ul.section span.subsection_title, 
#index ul.section span.subsection_title a 
{ line-height: 1.3em; text-decoration: none; cursor: pointer; width: auto; text-align: left; }
#index ul.section span.subsection_title, #index ul.subsection span.subsection_title a 
{ /* font-weight: bold; */ }
#index ul.section span.subsection_title:hover, #index ul.section span.subsection_title a:hover 
{ text-decoration: underline; }
/* indent if using chronological or tag groups */
ul.subsection { /* padding-left: 5px; */ }

/* exhibit titles */
/* NEED TO REVIEW ALL OF THESE STILL */
#index ul.section li.exhibit_title { width: auto; text-align: center; margin: 0px 0px 0px 0px; }
#index ul.section li.exhibit_title a:link { text-decoration: none; }
#index ul.section li.exhibit_title a:hover { text-decoration: underline; }
#index ul.section li.exhibit_title a:active {  }
#index ul.section li.exhibit_title a:visited {  }
#index ul.sectino li.section-link {  }
#index ul.section li#ndxz-searcher {  }

/* for 'all tags' display */
#index ul.all_tags { list-style-type: none; margin-bottom: 9px; }
#index ul.all_tags li { display: inline; margin-right: 3px; }
#index ul.all_tags li a {  }

/* need to review this still */
/* active parts */
li.active a:link, li a.active, 
li.active a:hover, li a.active, 
li.active a:active, li a.active, 
li.active a:visited, li a.active, 
li span.active, 
#index ul.section li.active a:link, 
#index ul.section li.active a:hover, 
#index ul.section li.active a:active, 
#index ul.section li.active a:visited
{ width: auto; text-align: left; }
#index p { width: auto; text-align: left; }

/* additional #index options */
#index ul li .password a { /* background: url(../img/locked.gif) right center no-repeat; */ padding-right: 18px; }
/* "new" */
#index ul li sup { color: #0c0; font-weight: bold; text-transform: uppercase; font-size: 8px; vertical-align: top; }
/* END INDEX STYLING */

#hmplusnet-credit
{
	position: fixed;
	bottom: 0;
	left: 0;
	padding: 0 0 14px 40px;
	width: 200px;
}

#hmplusnet-credit a
{
	background: #fff;
}

/* INDEXHIBIT CREDIT : Always good to credit the CMS that gives you these possibilities */
#copy.bottom-section { /* sets the properties for the "Built with" part  */
z-index : 100;
right : 0;
bottom : 0;
margin : 0 0 0 0;
padding : 0px 40px 14px 0px;
text-align : right; }
#copy  {
  /* Netscape 4, IE 4.x-5.0/Win and other lesser browsers will use this */
  position: absolute; }
body > #copy  {
  /* used by Opera 5+, Netscape6+/Mozilla, Konqueror, Safari, OmniWeb 4.5+, iCab, ICEbrowser */
  position: fixed; }
#copy.bottom-section  {
  /* Netscape 4, IE 4.x-5.0/Win and other lesser browsers will use this */
  position: absolute; }
body > #copy.bottom-section  {
  /* used by Opera 5+, Netscape6+/Mozilla, Konqueror, Safari, OmniWeb 4.5+, iCab, ICEbrowser */
  position: fixed; }
/* END INDEXHIBIT CREDIT STYLING */

#exhibit { 
	margin-top: 115px;
	margin-bottom: 65px;
}

/* links styles for the #exhibit region */
#exhibit a:link {  } 
#exhibit a:hover {  } 
#exhibit a:active {  } 
#exhibit a:visted {  } 

/* this is where you adjust your paddings for #index and #container */
.container { padding: 27px 9px 25px 27px; }

/* if the needed is to have different paddings in each region */
#index .container {
    padding: 25px 0 0 20px;
}
#exhibit .container {  padding: 30px 0px 0px 40px;  }

#index .top { height: 36px; float: left; }
#exhibit .top { display: none; }
#show .top { height: 36px; }


/* headings - if you use them - you should be */
h1 { font-size: 12px; margin-bottom: 9px; font-weight: bold; }

h2 {
	font-size: 160px;
	line-height: 120%;
	letter-spacing: -16px;
	font-weight: bold;
	padding: 0px 0px 10px 0px;
}

h3 {
	font-size: 53px;
	line-height: 100%;
	letter-spacing: -5px;
	font-weight: bold;
	padding: 0px 0px 10px 0px;
}

h4 {
	font-size: 27px;
	line-height: 100%;
	letter-spacing: -2px;
	font-weight: bold;
	padding: 0px 0px 10px 0px;
}

/* paragraphs - for the most part */
#exhibit p, #ndxz-media p { width: 600px;
	margin: 0px 0px 5px 0px;
	position: static;
	line-height: 1.3em; }

p, object, .flash-apl, .flash-flv { margin: 0 0 9px 0; width: 600px; }
object { display: block; }
.flash-flv { display: inline; }

.copyrighted { margin-top: 18px; padding-top: 220px; }

/* generic #img-container - but remember that exhibtion formats can override these */
#img-container { margin: 0; padding: 0; }
#img-container p { width: 600px; margin: 0; padding: 0 0 12px 0; }

/* some generic oft used rules */
.highlight { background: #ccff00; color: #000; }
small { font-size: 9px; }
.once { clear: left; }

margin: 0 auto;

#container{display:table; margin: 0 auto}