plugin easySlider is not a function ?
	
	
		Bonjour à tous j'ai un probleme en essayant de faire un diaporama(slideshow) en javascript à l'aide de la bibliotheque jquery et de son plugin easyslider j'obtiens une erreur comme celle-ci ""$(".slider").easySlider is not a function"
	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="fr" >
 
   <head>
       <title>New York Shoes NYS Copyright 2011</title>
       <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
       <link rel="stylesheet" media="screen" type="text/css" title="Exemple" href="design_NYS.css" />
       <link type="text/css" rel="stylesheet" href="animated-menu.css"/>
       <!--[if !IE]> <-->
		<style type="text/CSS">
		#menu li ul 
		{
 		position:absolute;
 		}
		</style>
		<!--><![endif]-->
 
		<!--[if IE 8]>
		<style type="text/CSS">
		#menu li ul 
		{
 		position:absolute;
 		}
		</style>
		<![endif]--> 
        <script type="text/javascript" src="script.js"></script>
 
    	<script src="http://jqueryjs.googlecode.com/files/jquery-1.3.js" type="text/javascript"></script>
    	<script src="js/jquery.easing.1.3.js" type="text/javascript"></script>
    	<script src="js/animated-menu.js" type="text/javascript"></script>
        <script src="js/slider.js" type="text/javascript"></script>
 
 
 
   </head>
   <body onload="demarrage()">
 
 
 
   	<div id="en_tete">  	   	
	</div>
 
   <div id="menu">	 	
   		<ul>
			<li class="firstcase">
				<p><a href="#">Men</a></p>
				<p class="subtext">New Products</p>
				<p class="subtext">brands</p>
				<p class="subtext">Kind of shoes</p>
 
			</li>
			<li class="secondcase">
				<p><a href="#">Women</a></p>
				  <p class="subtext">New Products</p>
				<p class="subtext">brands</p>
				<p class="subtext">Kind of shoes</p>
			</li>
			<li class="thirdcase">
				<p><a href="#">Children</a></p>
				  <p class="subtext">New Products</p>
				<p class="subtext">brands</p>
				<p class="subtext">Kind of shoes</p>
			</li>
			<li class="fourthcase">
				<p><a href="#">Good Deals</a></p>
				<p class="subtext">Good Deals's Page</p>
			</li>
 
			<li class="fifthcase">
				<p><a href="#">Retour</a></p>
				<p class="subtext">Retour</p>
			</li>
    	</ul>
   	</div>
 
	<div id="corps">	
 
 
        <div class="slider">
        	<ul>
                	<li><img src="images/img1.jpg"/></li>
                    <li><img src="images/img2.jpg"/></li>
                    <li><img src="images/img3.jpg"/></li>
                </ul>
        </div>
 
 
		<div id="browsmosaic">
		<div class="firstline">
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="f1"/></a>
 
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin"/></a>
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin" /></a>
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin"/></a>
 
		</div>
 
        <div class="secondline">
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="f1"/></a>
 
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin"/></a>
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin" /></a>
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin"/></a>
 
		</div>
 
        <div class="thirdline">
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="f1"/></a>
 
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin"/></a>
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin" /></a>
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin"/></a>
 
		</div>
 
        <div class="fourthline">
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="f1"/></a>
 
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin"/></a>
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin" /></a>
		<a href=""><img src="images/jordan1.jpg" alt="chaussures" class="colums_needmargin"/></a>
 
		</div>
 
 
 
 
      </div>  	
   	</div>
 
	<div id="pied_de_page">	
   		<p>Copyright "New York Shoes NYS", all rights reserved</p>
   		<p>by ANDRE Valentin</p>
   		<p class="dateC">2011</p>
        <p><a href="mailto:valentin.ece@gmail.com">Contact</a></p> 
        <p><img id="logo" src="images/logo.png" alt="logo"/></p>  		
	</div>
 
 
 
 
 
   </body>
 
 
</html> | 
 
	Code:
	
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 | $(document).ready(function(){
	$(".slider").easySlider({
		auto:true,
		continuous:true
	});
}); | 
 
Merci beaucoup de vos réponses.