Div, problème de supperposition

Bonjour à tous !!! :)
J'utilise un système de menu déroulant en css sur mon site et "petit problème", je dirais même plutot "gros problème" car la plus-part des forums où je vais me donnent aucune explication à mon problème. Les sous menu s'affichent en arrière plan sur mon site

Ma feuille CSS du menu :

Code:

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#menuDeroulant
{
	float: right;
	background: #F23000;
	width: 800px;
	height: 21px;
	list-style-type: none;
	margin: 0px;
	padding: 10px;
	border: 0;
	position: inherit;
	top: 0;
	left: 0;
	z-index:1000;
	background: #FFFFFF url(images/img01.gif) repeat-x;
 
}
#menuDeroulant li
{
	float: right;
	width: 75px;
	margin: 0;
	padding: 0;
	border: 0;
	z-index:1000;
}
#menuDeroulant li a:link, #menuDeroulant li a:visited
{
	display: block;
	height: 1%;
	color: #FFF;
	background: #F23000;
	margin: 0;
	padding: 4px 8px;
	border-right: 0px solid #fff;
	text-decoration: none;
	z-index:1000;
}
#menuDeroulant li a:hover { background-color: #F23000; }
#menuDeroulant li a:active { background-color: #F23000; }
 
#menuDeroulant .sousMenu
{
	display: none;
	list-style-type: none;
	margin: 0;
	padding: 0;
	border: 0;
	z-index:1000;
	}
#menuDeroulant .sousMenu li
{
	float: right;
	margin: 0;
	padding: 0;
	border: 0;
	width: 149px;
	border-top: 1px solid transparent;
	border-right: 1px solid transparent;
	z-index:1000;
}
#menuDeroulant .sousMenu li a:link, #menuDeroulant .sousMenu li a:visited
{
	display: block;
	color: #FFF;
	margin: 0;
	border: 0;
	text-decoration: none;
	background: transparent url("fondTR.png") repeat;
	z-index:1000;
}
#menuDeroulant .sousMenu li a:hover
{
	display: block;
	color: #FFF;
	margin: 0;
	border: 0;
	text-decoration: none;
	background: transparent url("fondTR2.png") repeat;
	z-index:1000;
}
 
#menuDeroulant li:hover > .sousMenu { display: block; }

La feuille CSS du design :

Code:

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body {
	margin: 0;
	padding: 0;
	background: #FFFFFF url(images/img01.gif) repeat-x;
	font: 13px Arial, Helvetica, sans-serif;
	color: #626262;
}
 
form {
	margin: 0;
	padding: 0;
}
 
input {
	padding: 5px;
	background: #FEFEFE url(images/img13.gif) repeat-x;
	border: 1px solid #626262;
	font: normal 1em Arial, Helvetica, sans-serif;
	z-index:500;
}
 
h1, h1 a, h2, h2 a, h3, h3 a {
	margin: 0;
	text-decoration: none;
	font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
	color: #444444;
}
 
h1 {
	letter-spacing: -3px;
	font-size: 2.6em;
}
 
h2 {
	letter-spacing: -2px;
	font-size: 2em;
	z-index:500;
}
 
h3 {
	font-size: 1em;
}
 
p, ol, ul {
	margin-bottom: 2em;
	line-height: 200%;
}
 
blockquote {
	margin: 0 0 0 1.5em;
	padding-left: 1em;
	border-left: 5px solid #DDDDDD;
}
 
a {
	color: #EB1400;
}
 
a:hover {
	text-decoration: none;
}
 
/* Header */
 
#header {
	height: 82px;
	z-index:1000;
 
}
 
#logo h1, #logo p {
	float: left;
}
 
#logo h1 {
	padding: 13px 0 0 25px;
}
 
#logo p {
	margin: 0;
	padding: 20px 0 0 4px;
	line-height: normal;
	text-transform: lowercase;
	font-weight: bold;
}
 
#logo a {
	text-decoration: none;
	color: #FFFFFF;
}
 
#menu {
	float: right;
}
 
#menu ul {
	margin: 0;
	padding: 0;
	list-style: none;
}
 
#menu li {
	display: block;
	float: left;
	height: 82px;
}
 
#menu a {
	display: block;
	width: 110px;
	height: 46px;
	padding: 24px 0 0 0;
	text-decoration: none;
	text-align: center;
	letter-spacing: -1px;
	font: bold 1.6em "Trebuchet MS", Arial, Helvetica, sans-serif;
	color: #FABEB3;
}
 
#menu a:hover {
	width: 108px;
	background: url(images/img03.gif) repeat-x;
	border-left: 1px solid #FFFFFF;
	border-right: 1px solid #FFFFFF;
	color: #EB1400;
}
 
#menu .current_page_item {
	background: url(images/img02.gif) no-repeat center bottom;
}
 
#menu .current_page_item a {
	width: 108px;
	background: #FFEC70 url(images/img03.gif) repeat-x;
	border-left: 1px solid #FFFFFF;
	border-right: 1px solid #FFFFFF;
	color: #EB1400;
}
 
/* Page */
 
#page {
	padding: 40px 60px 0 60px;
	z-index:500
}
 
/* Content */
 
#content {
	margin-right: 340px;
}
 
.post {
	margin-bottom: 10px;
	background: url(images/img05.gif) repeat-x;
}
 
.post .title {
	background: url(images/img07.gif) no-repeat right top;
}
 
.post .title h2 {
	padding: 30px 30px 0 30px;
	background: url(images/img06.gif) no-repeat;
	font-size: 2.2em;
}
 
.post .title p {
	margin: 0;
	padding: 0 0 0 30px;
	line-height: normal;
	color: #BABABA;
}
 
.post .title p a {
	color: #BABABA;
}
 
.post .entry {
	padding: 20px 40px 20px 30px;
}
 
.post .links {
	margin: 0;
	padding: 0 30px 30px 30px;
	background: url(images/img15.gif) no-repeat left bottom;
}
 
.post .links a {
	padding: 0 23px;
	text-decoration: none;
	font-weight: bold;
}
 
.post .links a:hover {
	text-decoration: underline;
}
 
.post .links .more {
	background: url(images/img16.gif) no-repeat left center;
}
 
.post .links .comments {
	background: url(images/img17.gif) no-repeat left center;
}
 
/* Sidebar */
 
#sidebar {
	float: right;
	width: 300px;
}
 
#sidebar ul {
	margin: 0;
	padding: 0;
	list-style: none;
}
 
#sidebar li {
	margin-bottom: 10px;
	background: url(images/img10.gif) no-repeat left bottom;
}
 
#sidebar li ul {
	padding: 0 30px 40px 30px;
}
 
#sidebar li li {
	margin: 0;
	padding-left: 20px;
	background: url(images/img11.gif) no-repeat 5px 50%;
}
 
#sidebar h2 {
	padding: 30px 30px 20px 30px;
	background: url(images/img09.gif) no-repeat;
	font-weight: normal;
	color: #EB1400;
}
 
/* Search */
 
#search {
	padding: 20px 30px 40px 30px;
}
 
#search input {
	padding: 0;
	width: 70px;
	height: 29px;
	background: #DFDFDF url(images/img14.gif) repeat-x;
	font-weight: bold;
}
 
#search #s {
	padding: 5px;
	width: 150px;
	height: auto;
	background: #FEFEFE url(images/img13.gif) repeat-x;
	border: 1px solid #626262;
	font: normal 1em Arial, Helvetica, sans-serif;
}
 
#search br {
	display: none;
}
 
/* Categories */
 
#sidebar #categories li {
	background: url(images/img12.gif) no-repeat left center;
}
 
/* Calendar */
 
#calendar_wrap {
	padding: 0 30px 40px 30px;
}
 
#calendar table {
	width: 100%;
	text-align: center;
}
 
#calendar thead {
	background: #F1F1F1;
}
 
#calendar tbody td {
	border: 1px solid #F1F1F1;
}
 
#calendar #prev {
	text-align: left;
}
 
#calendar #next {
	text-align: right;
}
 
#calendar tfoot a {
	text-decoration: none;
	font-weight: bold;
}
 
#calendar #today {
	background: #FFF3A7;
	border: 1px solid #EB1400;
	font-weight: bold;
	color: #EB1400
}
 
/* Footer */
 
#footer {
	padding: 70px 0 50px 0;
	background: #757575 url(images/img08.gif) repeat-x;
}
 
#footer p {
	margin-bottom: 1em;
	text-align: center;
	line-height: normal;
	font-size: .9em;
	color: #BABABA;
}
 
#footer a {
	padding: 0 20px;
	text-decoration: none;
	color: #DDDDDD;
}
 
#footer a:hover {
	color: #FFFFFF;
}
 
#footer .rss {
	background: url(images/img18.gif) no-repeat left center;
}
 
#footer .xhtml {
	background: url(images/img19.gif) no-repeat left center;
}
 
#footer .css {
	background: url(images/img20.gif) no-repeat left center;
}
 
#footer .legal a {
	padding: 0;
}
 
.gallery{
          margin:0; padding:0;
          overflow:hidden; /* Clears the floats */
          width:600px; /* IE and older Opera fix for clearing, they need a dimension */
          list-style:none;
        }
          .gallery li{
            float:left;
            display:inline; /* For IE so it doesn't double the 1% left margin */
            width:23.8%;
            margin:0 0 10px 1%; padding:10px 0;
            height:83px; /* Height of img (75) + 2 times 3px padding + 2 times 1px border = 83px */
            position:relative; /* This is the key */
            background:url(45degree.png);
          }
            .gallery a,
            .gallery img{
              display:block;
              width:100%;
            }
 
            a img{ border:none; } /* A small fix */
 
            .gallery a:link,
            .gallery a:visited,
            .gallery a:focus,
            .gallery a:hover,
            .gallery a:active{
              padding:3px;
              background:#eeefef;
              width:75px; height:75px;
              border:1px solid #eeefef; /* We blend the border with the bg, as if it isn't there */
              position:absolute; top:50%; left:50%; /* position it so that image's top left corner is in the center of the list item */
              margin:-41px 0 0 -41px; /* Pull the image into position with negative margins (margins value is half of the width of the image) */
            }
            .gallery a:hover{
              border-color:#dfdfdf;
            }
 
            /* These are all optional, for decoration purpouses only */
            .gallery{
              padding-bottom:10px;
              margin-top:10px;
            }

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