Menu déroulant dans ma page

Bonjour ,

j'ai un problème de la menu déroulante dans ma page il ne fonctionne pas

voici la page html

Code:

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
	<meta name="author" content="David Herreman (www.free-css-templates.com)" />
	<meta http-equiv="content-type" content="text/html;charset=iso-8859-2" />
	<link rel="stylesheet" href="images/style.css" type="text/css" />
	<title>Bienvenu sur l'intranet de l'isim !!</title>
	<script language="JavaScript">
<!--
function FP_swapImg() {//v1.0
 var doc=document,args=arguments,elm,n; doc.$imgSwaps=new Array(); for(n=2; n<args.length;
 n+=2) { elm=FP_getObjectByID(args[n]); if(elm) { doc.$imgSwaps[doc.$imgSwaps.length]=elm;
 elm.$src=elm.src; elm.src=args[n+1]; } }
}
 
function FP_preloadImgs() {//v1.0
 var d=document,a=arguments; if(!d.FP_imgs) d.FP_imgs=new Array();
 for(var i=0; i<a.length; i++) { d.FP_imgs[i]=new Image; d.FP_imgs[i].src=a[i]; }
}
 
function FP_getObjectByID(id,o) {//v1.0
 var c,el,els,f,m,n; if(!o)o=document; if(o.getElementById) el=o.getElementById(id);
 else if(o.layers) c=o.layers; else if(o.all) el=o.all[id]; if(el) return el;
 if(o.id==id || o.name==id) return o; if(o.childNodes) c=o.childNodes; if(c)
 for(n=0; n<c.length; n++) { el=FP_getObjectByID(id,c[n]); if(el) return el; }
 f=o.forms; if(f) for(n=0; n<f.length; n++) { els=f[n].elements;
 for(m=0; m<els.length; m++){ el=FP_getObjectByID(id,els[n]); if(el) return el; } }
 return null;
}
// -->
</script>
</head>
<body onload="FP_preloadImgs(/*url*/'images/buttonB.jpg',/*url*/'images/buttonC.jpg',/*url*/'images/buttonE.jpg',/*url*/'images/buttonF.jpg')">
	<div class="content">
			<div class="preheader">
				<div class="padding">					&nbsp;
				</div>
			</div>
 
			<div class="header">
				<div class="title"></div>
				<div class="slogan"></div>
			</div>
 
			<div id="nav">
			  	<ul>
					<li ><a href="index_connecter.html">Acceuil</a></li>
					<li> <a href="Archive_Connecter.html">Archive </a>
					<ul class="sousMenu">
            <li class=><a href="Entrant.html">Entrant</a></li>
            <li class="><a href="Sortant.html">Sortant</a></li>
         </ul>
      </li> 
					<li><a href="Courrier_Electronique.html">Courrier_Electronique </a></li>
					<li><a href="Compte_Connecter.html">&nbsp;Compte</a></li>
					<li><a href="Statistique_Connecter.html">Statistique</a></li>
					<li><a href="Manifestation_Connecter.html">&nbsp;Manifestation</a></li>
					<li><a href="Deconnexion_Connecter.html">&nbsp;Deconnexion</a></li>
 
      			</ul>
			</div>
 
			<div class="main_content">
			<div class="sd_left" style="width: 237px; height: 434px">
			  <div class="text_padding">	
			  <h2 align="justify">
				<img border="0" src="images/noUserPix.gif" width="21" height="18">Bureau d'ordre </h2>
			  <p align="center">&nbsp;</p>
			  <p>&nbsp; </p>
			  <p align="center">&nbsp;  
				<img border="0" id="img4" src="images/buttonA.jpg" height="20" width="100" alt="Deconnexion" onmouseover="FP_swapImg(1,0,/*id*/'img4',/*url*/'images/buttonB.jpg')" onmouseout="FP_swapImg(0,0,/*id*/'img4',/*url*/'images/buttonA.jpg')" onmousedown="FP_swapImg(1,0,/*id*/'img4',/*url*/'images/buttonC.jpg')" onmouseup="FP_swapImg(0,0,/*id*/'img4',/*url*/'images/buttonB.jpg')" fp-style="fp-btn: Braided Row 1" fp-title="Deconnexion"></p>
			  <p align="center"><br>
			       <br>
			    </p>
				 <h2>Liens Utiles</h2>
				<h2>&nbsp;</h2>
 
			            <p align="left">
						<img src="images/weblink.png" width="13" height="13" /><a href="http://www.universites.tn/">Ministere 
						de l'Enseignement supérieur</a></p>
			            <p align="left">
						<img src="images/weblink.png" width="13" height="13" /><a href="http://www.edunet.tn">Ministere de l'Éducation 
						et de la Formation</a></p>
			            <p align="left">
						<img src="images/weblink.png" width="13" height="13" /><a href="http://www.ministeres.tn/">Sites des Ministeres
						</a></p>
				<p align="left">
				<img src="images/weblink.png" width="13" height="13" /><a href="http://www.orientation.tn">Site de l'orientation</a></p>
              </div>
			</div>
 
					<div class="sd_center">
					<div class="text_padding">	
						<p>&nbsp; </p>
						<br />				
					</div>
				</div>
 
				<div class="sd_left" style="width: 166px; height: 231px">
					<div class="text_padding">	
						<p align="center"><img border="0" src="images/loupe.gif" width="19" height="18" align="left" />
						    <input name="password0" id="password0" style="float: left" />
					  </p>
						<p>&nbsp;</p>
						<p><br class="spacer" />
                        </p>
						<p align="center">&nbsp; 
						<img border="0" id="img5" src="images/buttonD.jpg" height="20" width="100" alt="Rechercher" onmouseover="FP_swapImg(1,0,/*id*/'img5',/*url*/'images/buttonE.jpg')" onmouseout="FP_swapImg(0,0,/*id*/'img5',/*url*/'images/buttonD.jpg')" onmousedown="FP_swapImg(1,0,/*id*/'img5',/*url*/'images/buttonF.jpg')" onmouseup="FP_swapImg(0,0,/*id*/'img5',/*url*/'images/buttonE.jpg')" fp-style="fp-btn: Braided Row 1" fp-title="Rechercher"></p>
							<p class="date"><img src="images/comment.gif" alt="" /> 
							Options </p><br />
							&nbsp;<p>&nbsp;</p>
						<h2>Actualité</h2>
						<p class="date">&nbsp;
						</p>
						<p class="date">&nbsp;
						</p>
						<p class="date">
						.</p><br />				
				  </div>
				</div>
 
 
 
 
				<div class="footer">
					<div class="padding">
						Powered by SEGNI	Kais
						|SAYAHI SALEM
						|MAHDHAOUI Haythem
					|&copy; Copyright Isimm 2011 :: Design: SEGNI Kais</div>
				</div>
 
 
 
</body>
</html>

et ici la feuille de style css

Code:

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/*
By Herreman David
http://www.free-css-templates.com
StyleSheet for BinaryNews Template
*/
 
body {
 background-color: #e7e7e7;
 color: #FFF;
 padding: 0; margin: 0; font: 0.7em Arial, sans-serif; line-height: 1.5em;
}
 
a { color: #46574D; background: inherit; }
a:hover { color: #647B6D; background: inherit;}
 
h1 { font: bold 2em Arial, Sans-Serif; letter-spacing: -1px; padding: 16px 0 0 8px; margin: 0; }
h2 { margin: 0; padding: 0; font: normal 1.6em Arial, Sans-Serif; letter-spacing: -1px; }
h1 a { color: #46574D; background: inherit; }
h1 a, h2 a { text-decoration: none; }
h1 a:hover, h2 a:hover { color: #BFE1ED; background: inherit; }
h3 { font: 90% Arial, Sans-Serif; margin: 0 0 10px 0; padding: 0; color: #46574D; background: #FFF; }
p {	margin: 0 0 0px 0; line-height: 1.5em; }
form { margin: 0; }
 
input.search { width: 122px; height: 15px; border: 1px dashed #46574D; background: #FFF url(input.jpg) no-repeat; padding: 3px; color: #616161; }
input.submit { width: 28px; height: 20px; font-weight: bold; border: none; background: #FFF; padding: 3px; color: #616161; }
 
 
 
.content { 
    background: #FFF; 
	margin: 0 auto;
	padding: 0px;
	width: 886px;
	color: #000;
}
 
.preheader {
	background: #000 url(preheader.jpg) no-repeat center bottom;
	color: #FFF;
	width: 886px;
	height: 71px;
	margin: 0;
	padding: 0;
}
 
	.preheader a { color: #FFF; background: inherit; text-decoration:none; }
	.preheader a:hover { color: #FFF; background: inherit;}
 
.preheader .padding {
 
	float: right;
	padding: 52px 70px 0 0;
	color: #FFF;
}
 
.header {
	background: #000 url(header.jpg) no-repeat center bottom;
	color: #FFF;
	width: 886px;
	height: 78px;
	margin: 0;
	padding: 0;
}
 
.header .title {
	float: left;
	padding: 12px 0 0 84px;
	color: #FFF;
	font: bold 1.8em Arial, sans-serif;
}
 
.header .slogan {
	float: left;
	clear: both;
	padding: 2px 0 0 84px;
	color: #FFF;
	font: bold 0.8em Arial, sans-serif;
}
 
#nav {
	background: #000 url(menu.jpg) no-repeat center bottom;
	background-color: #000;
	width: 886px;
	height: 28px;
	margin: 0;
	padding: 0;
}
 
#nav ul { margin:0; list-style:none; padding: 0px 0 0 200px; }
#nav a, #nav strong, #nav span { float:left; display:block; color:#fff; padding: 5px 10px 5px 10px; background: #9e9e9e; text-decoration:none; font-weight: bold; }
#nav a { float:none; }
#nav li { float:left; color: #FFF; background: #9e9e9e; margin:0; padding:0 0 0 0px; }
#nav #current { float:left; background: #aeaeae; color: #FFF; }
#nav #current a { float:left; background: #aeaeae; padding:5px 10px 5px 10px; color:#FFF; }
#nav a:hover { float:left; color:#FFF; background: #aeaeae; }  
#nav .padding { padding: 5px 0 0 10px; font-weight: bold; }
 
#nav .sousMenu
{
list-style-type: none;
margin: 0;
padding: 0;
border: 0;
} 
#nav .sousMenu li
{
float: none;
margin: 0;
padding: 0;
border: 0;
}
 
#nav .sousMenu li
{
float: none;
margin: 0;
padding: 0;
border: 0;
width: 149px;
border-top: 1px solid transparent;
border-right: 1px solid transparent;
}
#nav .sousMenu
{
display: none;
list-style-type: none;
margin: 0;
padding: 0;
border: 0;
}
#nav li:hover > .sousMenu { display: block; }
 
.main_content {
	background: #FFF url(bg.jpg) repeat-y center bottom;
	background-color: #FFF;
	margin: 0 auto;
	padding: 0px;
	width: 886px;
}
 
.sd_center {
 
    background-color: #FFF;
	color: #000;
	margin: 0 0 0px 20px;
	padding: 0px 20px 0px 5px;
	width: 320px;
	float:left;
 
}
.sd_left {
 
    background-color: #FFF;
	color: #000;
	margin: 0 0 0px 20px;
	padding: 0px 20px 0px 5px;
	width: 200px;
	float:left;
 
}	
 
.sd_right {
    clear:both;
    background-color: #FFF;
 
	color: #000;
	margin: 0 90px 0 0;
	padding: 0px 0px 0 15px;
	width: 170px;
	border-left: 1px dashed #ccc;
	float:left;
}	
 
/* For IE... */
* html .sd_right {
    clear:both;
    background-color: #FFF;
	float: right;
	color: #000;
	margin: 0 40px 0 0;
	padding: 0px 0px 0 15px;
	width: 170px;
	border-left: 1px dashed #ccc;
}	
 
 
.text_padding {
	padding: 15px 0 0 0;
}
 
.main_content h2 {
	background-color: #FFF;
	padding: 5px 0 5px 0;
	color: #46574D;
	font: bold 1.6em Arial, sans-serif;
}
 
 
.date { 
	color: #46574D; 
	background: #FFFFFF;
	text-align: right; 
	margin: 10px 0 5px 0; 
	padding: 0.4em 0 0 0; 
	border-top: 1px solid #eee;
}
 
input.button { 
	background: #FFFFF4; 
	color: #808080;
	border-right: 1px solid #ccc;
	border-bottom: 1px solid #ccc;
}
 
.comments { 
	padding: 10px 10px 8px 10px; 
	margin: 0 0 7px 0; 
	background: #f8f8f8; 
	color: #000;
}
 
.commentsbox { 
	padding: 8px 0 10px 10px; 
	margin: 0 0 10px 0; 
	background: #f4f4f4; 
	color: #000;
}
 
.error {
	color: #990000;
	background-color: #FFF0F0;
	padding: 7px;
	margin-top: 5px;
	margin-bottom: 10px;
	border: 1px dashed #990000;
}
.error h2 {
	color: #990000;
	background: inherit;
}
 
.success {
	color: #000000;
	background: #F5FBE1;
	padding: 7px;
	margin-top: 5px;
	margin-bottom: 5px;
	border: 1px dashed #7BA813;
}
.success h2 {
	color: #7BA813;
	background: inherit;
}
 
.footer { 
	background: #000 url(footer.jpg) center no-repeat;
	width: 886px;
	height: 78px;
	color:#555;  
	font-size:90%;
	text-align:center; 
	clear:both;
}
 
		.footer .padding {
			padding: 40px 0 0 0;
 
		}