hola aqui ter dejo un codigo html , copiar pegar, el jquery ponlo en el mismo nivel o si esta en otro nivel, cambia el src del script en el html
fijate como llamo a los elementos en la funcion de jquery, primero el elemento html y luego su id, en el caso de ser una class lo llamaria asi
("p .mi_clase").elcodigoquesigue
bueno espero que te sirva, yo lo probé y funciona.
Saludos
Código:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Untitled Document</title>
<meta name="generator" content="HAPedit 3.1">
<script src="jquery.js" type="text/javascript"></script>
<script type="text/javascript">
$(document).ready(function (){
$("li#acerca-de").click(function (){
$("div#menu_principal").animate({height:200}, "slow");
$("div#acerca-de-elcatalodo").show("slow")
// alert(numero);
});
$("a#cerrar_acerca").click(function (){
$("div#menu_principal").animate({height:60}, "slow");
$("div#acerca-de-elcatalodo").hide("slow")
});
//
});
</script>
</head>
<body>
<div id="menu_principal">
<div id="acerca-de-elcatalodo"><strong>Lorem Ipsum</strong> is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.<a id="cerrar_acerca">CERRAR AQUI CLICK AQUI!!!</a></div>
<div id="login_form"></div>
</div>
<div id="todo_blanco">
<div id="contenedor_catalogo">
<div id="menu">
<ul id="nav">
<li id="acerca-de"><a href="#">?</a></li>
</ul>
</div>
</div>
</div>
<div id="pie">Copyright ©2007 Nombre usuario ejemplo XHTML | CSS | Get Firefox</div>
</body>
</html>
espero te funcione