Bonjour,
je veux mettre un sous-menu dans mon menu , j'ai la page index.html:

Code : Sélectionner tout - Visualiser dans une fenêtre à part
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<body id="page1">
<div class="main">
<!-- header -->
	<header>
 
		<div class="wrapper">
			<h1><a href="index.html" id="logo">BSC Algérie</a></h1>
			<!--<form id="search" action="" method="post">
				<div class="bg">
 
			  </div>
			</form>-->
            <h1><a href="http://localhost/drupal-7.10/?q=node/3">Espace Client</a></h1>
		</div>
		<nav>
			<ul id="menu">
				<li class="alpha" id="menu_active"><a href="index.html"><span><span>Accueil</span></span></a></li>
				<li><a href="produit.html"><span><span>Produits</span></span> </a></li>
				<li><a href="Services.html"><span><span>Services</span></span></a></li>
				<li><a href="Références.html"><span><span>Références</span></span></a></li>
	            <li  class="omega"><a href="#"><span><span>Contact</span></span> </a>
		                <ul id="sousmenu1" style="display: none;">
					    	<li><a href="Imlantation.html">Implantation</a></li>
							<li><a href="Nous rejoindre.html">Nous Rejoindre</a></li>
							<li><a href="drupal.html">Demande d'informations</a></li>
	</ul></li>
			</ul>
		</nav>
		<div class="wrapper">
			<div id="flash">
 
              <script type="text/javascript">
AC_FL_RunContent( 'codebase','http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,28,0','width','912','height','300','src','flash/modifac31','quality','high','pluginspage','http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash','movie','flash/modifac31' ); //end AC code
</script><noscript><object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,28,0" width="912" height="300">
                <param name="movie" value="flash/modifac31.swf">
                <param name="quality" value="high">
                <embed src="flash/modifac31.swf" quality="high" pluginspage="http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="912" height="300"></embed>
              </object></noscript>
</div>
	  </div>
	</header><div class="ic">More Website Templates at TemplateMonster.com!</div>
<!-- / header -->
dans mon fichier css:


Code : Sélectionner tout - Visualiser dans une fenêtre à part
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/* Getting the new tags to behave */ 
article,aside,audio,canvas,command,datalist,details,embed,figcaption,figure,footer,header,hgroup,keygen,meter,nav,output,progress,section,source,video {display:block} 
mark,rp,rt,ruby,summary,time {display:inline} 
.left {float:left} 
.right {float:right} 
.wrapper {width:100%;overflow:hidden}
 
/*#wrapper { 
   position: relative; 
   z-index: 0; 
} */
 
body {background:url(../images/bg_top2.gif) top repeat-x #e2e2e2;border:0;font:13px Arial,Helvetica,sans-serif;color:#323232;line-height:17px} 
.ic, .ic a {border:0;float:right;background:#fff;color:#f00;width:50%;line-height:10px;font-size:10px;margin:-220% 0 0 0;overflow:hidden;padding:0} 
.css3 {border-radius:8px;-moz-border-radius:8px;-webkit-border-radius:8px;box-shadow:0 0 4px rgba(0,0,0,.4);-moz-box-shadow:0 0 4px rgba(0,0,0,.4);-webkit-box-shadow:0 0 4px rgba(0,0,0,.4);behavior:url(js/PIE.htc);position:relative} 
.main {	margin:0 auto;	width:920px} 
a {color:#308da2;text-decoration:underline;outline:none} 
a:hover {text-decoration:none} 
h1 {float:left;padding:0px 0 0 0} 
/* {float:right;padding:10px 0 0 0} 
*/ 
.banners hx {width:430px;float:right;padding-right:13px} 
 
h2 {font-size:23px;font-weight:600;color:#33CC00;line-height:44px;padding-bottom:16px 0 9px 0;letter-spacing:-1px} 
h20{font-size:23px;font-weight:600;color:#33CC00;line-height:44px;padding-bottom:16px} 
.box h2 {padding:29px 0 16px 0} 
p {padding-bottom:17px} 
pv { 
  margin-top: 15px; 
  margin-bottom: 15px; 
} 
.video {  
  width: 750px;  
  height: 350px; 
  margin-right: 25px; 
  clear: left;   
} 
/* header */ 
header {} 
#logo {display:block;background:url(../images/logo.gif) no-repeat;width:245px;height:85px;text-indent:-5000px} 
#search {float:right;padding:35px 0 0 0} 
#search .bg {background:url(../images/search.gif) no-repeat;width:193px;height:36px} 
#search .submit {float:right;height:36px;width:40px;background:none;cursor:pointer} 
#search .input {float:right;background:none;font:13px Arial,Helvetica,sans-serif;color:#323232;height:16px;width:143px;padding:10px;padding-right:0} 
/*#menu {width:100%;overflow:hidden;margin-top:3px} 
 
#menu { 
 height:50px; 
 } 
#menu li {float:left} 
/**/ 
/*#menu ul li ul { 
 display:none; 
 } 
 #menu ul li:hover ul { 
 display:block; 
 } 
#menu li:hover ul li { 
 float:none; 
 } 
  
 #menu li ul { 
 position:absolute; 
  width: 144px; /* Largeur des sous-listes */ 
 
 /*}*/ 
 /**/ 
 
* { 
	position: relative; 
	z-index: 0; 
}
 
/*#menu { 
   position: relative; 
   z-index: 99; 
}*/ 
 
#menu { 
	width:100%; 
	overflow:hidden; 
	margin-top:3px 
}  
 
#menu ul { 
	z-index: 1; 
} 
/*#menu li {float:left}  */
#menu li {
    float: left;
    width: 182px;
}
 
#menu li ul {  
 position:relative;  
 width: 50;
 }
#sousmenu1 {
   position: absolute;
   width: 100px;
}
.menu li:hover{visibility:inherit} 
 
/**/  
#menu ul li ul {  
 display:none;  
 }  
 #menu ul li:hover ul {  
 display:block;  
 }  
#menu li:hover ul li {  
 float:none;  
 width:100% 
 }  
 
/* 
 #menu li ul {  
 position:relative;  
 z-index 
 } */ 
 /**/  
 
/*#menu a {  
	display:block;  
	font-size:17.1px;} 
	*/ 
#menu a { 
	display:block; 
	font-size:17.1px; 
	font-weight:400; 
	color:#000; 
	background:url(../images/menu.gif) top repeat-x; 
	line-height:55px; 
	text-decoration:none}  
 
#menu li span { 
	display:block; 
	background:url(../images/menu_left.gif) top left no-repeat 
}  
#menu .alpha span { 
	background:url(../images/left_menu.gif) top left no-repeat 
}  
#menu .alpha a:hover span,#menu .alpha#menu_active a span { 
	background:url(../images/left_menu_active.gif) top left no-repeat 
}  
#menu .omega span span { 
	background:url(../images/right_menu.gif) top right no-repeat 
}  
#menu .omega a:hover span span,#menu .omega#menu_active a span span { 
	background:url(../images/right_menu_active.gif) top right no-repeat 
}  
#menu li span span,#menu .alpha span span { 
	background:url(../images/menu_right.gif) top right no-repeat; 
	padding:0 60px 
}  
#menu a:hover,#menu #menu_active a { 
	color:#fff; 
	background:url(../images/menu_active.gif) top repeat-x 
}  
#menu a:hover span,#menu #menu_active a span { 
	background:url(../images/menu_left_active.gif) top left no-repeat 
}  
#menu a:hover span span,#menu #menu_active a span span,#menu .alpha#menu_active a span span,#menu .alpha a:hover span span { 
	background:url(../images/menu_right_active.gif) top right no-repeat 
} 
 
 
/**/ 
 
#nav-container{position:relative;display:block;width:1000px;margin:0 auto} 
 
#nav-container{z-index:1000;font-size:10px;/*text-align:center;text-transform:uppercase;border-top:1px dashed #666;border-bottom:1px dashed #666*/} 
nav {
 width: 912;
   z-index: 99;
}
 
/***************************************************/ 
 
 
 
/*fin*/ 
.text {background:url(../images/bg_img2.jpg) 1px 0 no-repeat;padding:18px 0 0 515px;width:325px;margin-top:15px;text-align:center;height:265px} 
.text1 {font-size:80px;font-weight:700;line-height:100px;color:#000;letter-spacing:-2px;display:block} 
.text1 span {display:block;font-size:40px;line-height:50px;margin-top:-17px;letter-spacing:-1px;padding-bottom:20px} 
.text .button {display:inline-block;font-size:30px;font-weight:700;color:#fff;line-height:53px;padding:0 37px;background:url(../images/button_bg.gif) top repeat-x #308da2;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px;behavior:url(js/PIE.htc);position:relative;text-decoration:none} 
.text .button:hover {background:#696969} 
#flash  
{float: right;  
border: 2px solid #ccc;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px;box-shadow:1px 1px 2px #cfcfcf;-moz-box-shadow:1px 1px 2px #cfcfcf;-webkit-box-shadow:1px 1px 2px #cfcfcf; 
width: 905px; 
margin-right: 10px;
margin-top: 10px;  
margin-bottom: 20px;   
height : 300px;  
}
 
 
/* content */ 
#content {margin-right:4px;background:url(../images/bg_cont.gif) bottom repeat-x #fff;border:1px solid #ccc;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px;box-shadow:1px 1px 2px #cfcfcf;-moz-box-shadow:1px 1px 2px #cfcfcf;-webkit-box-shadow:1px 1px 2px #cfcfcf;behavior:url(js/PIE.htc);position:relative} 
.pad {padding:0 30px 0 35px} 
.pad_left1 {padding-left:55px} 
.pad_left2 {padding-left:45px} 
.marg_right1 {margin-right:12px} 
.marg_right2 {margin-right:18px} 
.pad_bot1 {padding-bottom:35px} 
.pad_bot2 {padding-bottom:49px} 
.pad_bot3 {padding-bottom:7px; color:#33CC00} 
.pad_bot4 {padding-bottom:17px} 
.marg_top {margin-top:17px} 
.marg_top2 {margin-top:7px} 
.box {background:#f5f5f5;behavior:url(js/PIE.htc);position:relative;width:100%;overflow:hidden} 
.box.top {border-radius:10px 10px 0 0;-moz-border-radius:10px 10px 0 0;-webkit-border-radius:10px 10px 0 0;behavior:url(js/PIE.htc)} 
.box.bot {border-radius:0 0 11px 11px ;-moz-border-radius:0 0 11px 11px;-webkit-border-radius:0 0 11px 11px;behavior:url(js/PIE.htc)} 
.banners {padding:19px 0 19px 19px;overflow:hidden} 
.banners li {width:285px;float:left;padding-right:13px} 
/*a enlevé si ca marche pas: pour avoir 2 blocs en bas et non pas 3 */ 
.banners li1 {width:430px;float:left;padding-right:13px} 
.banners li2 {width:278px;float:left;padding-right:20px} 
 
.banners p {padding-bottom:7px} 
.banners p.font1 {font-weight:bold;color:#33CC00;padding:16px 0 7px 0} 
.banners .marker {background:url(../images/marker_1.gif) no-repeat} 
.banners .marker:hover {background:url(../images/marker_3.gif) no-repeat} 
.banners .pad {padding:0 10px 0 15px} 
 
/*banner pour la page prduits sage...*/ 
.banners1 {padding:14px 0 14px 14px;overflow:hidden} 
.banners1 li {width:285px;float:left;padding-right:13px} 
.banners1 p {padding-bottom:17px} 
.banners1 p.font1 {font-weight:bold;color:#33CC00;padding:16px 0 7px 0} 
.banners .marker {background:url(../images/marker_1.gif) no-repeat} 
.banners .marker:hover {background:url(../images/marker_3.gif) no-repeat} 
.banners .pad {padding:0 10px 0 15px} 
 
/*Fin banner prduits sage*/ 
.marker {display:inline-block;background:url(../images/marker_3.gif) no-repeat;width:17px;height:17px} 
.marker:hover {display:inline-block;background:url(../images/marker_1.gif) no-repeat;width:17px;height:17px} 
.line1 {background:url(../images/line_ver1.gif) 250px 0 repeat-y;padding:7px 0} 
.under {padding-bottom:17px;border-bottom:1px solid #ddd;margin-bottom:17px} 
.color1 {color:#308da2} 
.list1 li {line-height:23px type=square"} 
.list1 li a {padding-left:20px;background:url(../images/marker_2.gif) 5px 5px no-repeat} 
#text { margin-right:4px; margin-left: 200px; } 
 
.list1 li pu {padding-left:20px;background:url(../images/marker_2.gif) 5px 5px no-repeat} 
#text { margin-right:4px; margin-left: 200px; } 
 
/* footer */ 
footer {padding:25px 0 28px 0;width:100%;overflow:hidden;text-align:center;line-height:18px} 
footer a {} 
footer a:hover {} 
/* forms */ 
#ContactForm {font-weight:bold;color:#323232;line-height:28px} 
#ContactForm .wrapper {padding-bottom:6px} 
#ContactForm .bg {background:url(../images/bg_input.gif) top repeat-x #e6e6e6;float:right;margin-right:150px;border:1px solid #ccc;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px;box-shadow:1px 1px 2px #e3e3e3;-moz-box-shadow:1px 1px 2px #e3e3e3;-webkit-box-shadow:1px 1px 2px #e3e3e3;behavior:url(js/PIE.htc);position:relative;height:26px} 
#ContactForm .bg2 {background:url(../images/bg_textarea.gif) top repeat-x #e6e6e6;float:right;margin-right:2px;border:1px solid #ccc;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px;box-shadow:1px 1px 2px #e3e3e3;-moz-box-shadow:1px 1px 2px #e3e3e3;-webkit-box-shadow:1px 1px 2px #e3e3e3;behavior:url(js/PIE.htc);position:relative;height:191px} 
#ContactForm .button {margin-left:8px;margin-top:9px;float:right;margin-right:2px;font-size:20px;font-weight:700;color:#fff;line-height:35px;width:90px;text-align:center;background:url(../images/button_form.gif) top repeat-x #308da2;border-radius:10px;-moz-border-radius:10px;-webkit-border-radius:10px;behavior:url(js/PIE.htc);position:relative;text-decoration:none} 
#ContactForm .input {width:260px;height:16px;background:none;padding:5px 10px;color:#323232;font:13px Arial,Helvetica,sans-serif;margin:0} 
#ContactForm textarea {overflow:auto;width:408px;height:181px;background:none;padding:5px 10px;color:#323232;font:13px Arial,Helvetica,sans-serif;margin:0} 
#ContactForm .button:hover {background:#696969} 
 
 
///
le problème est que quand je clique sur contact, il m'affiche le sous menu, mais il décale mon animation donc c'est très moche!!

merci pour votre aide.