Probleminha com richfaces no IE

Olá!
Eu to com um probleminha estranho com richfaces qdo abro minha página no IE:

Linha: 3
Caracter: 42
Erro: 'Richfaces' não está definido.

Jah testei no firefox e não deu esse erro.
Esse erro somente acontece se eu coloco o rich:tabPanel. O engraçado que eu utilizo no mesmo jsp que tem um rich:datatable e funciona legal.

Ai vai o código:

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://java.sun.com/jstl/core" prefix="c1"%>
<%@taglib uri="http://richfaces.org/rich" prefix="rich"%>
<%@taglib uri="http://java.sun.com/jsf/core" prefix="f" %>
<%@taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Aloca&ccedil;&atilde;o de Turmas nas Salas</title>

<style type="text/css">
@import url("estilo.css");
</style>

</head>
<body>

<div class="cabecalho" title="Sistema de Controle de Instalações Físicas"></div>

<div id="data">
	
</div>
 
    <f:view>
	<div id="titulo">Alocação de Turmas nas Salas</div><br /><br />
	<h:form id="alocaform">
		<h:outputText value="Campus: " />
		<h:selectOneMenu id="campus" style="width: 170px" value="#{bAloca.codcampus}" styleClass="input_text">   
			<f:selectItems value="#{bCampus.listarCampus}"/>
		</h:selectOneMenu>
		
		<h:outputText value="Turma: " styleClass="paragrafo" />
		<h:selectOneMenu id="turma" style="width: 170px" value="#{bAloca.codturma}" styleClass="input_text">
			<f:selectItems value="#{bCampus.listarTurmas}"/>
		</h:selectOneMenu>
		
		<br /><br />
		
		<h:outputText value="Hora Inicial: "/>
		<h:selectOneMenu id="horainicio" style="width: 47px" value="#{bAloca.horainicio}" styleClass="input_text">
			<f:selectItem itemLabel="08" itemValue="08"/>
			<f:selectItem itemLabel="09" itemValue="09"/>
			<f:selectItem itemLabel="10" itemValue="10"/>
			<f:selectItem itemLabel="11" itemValue="11"/>
			<f:selectItem itemLabel="12" itemValue="12"/>
			<f:selectItem itemLabel="13" itemValue="13"/>
			<f:selectItem itemLabel="14" itemValue="14"/>
			<f:selectItem itemLabel="15" itemValue="15"/>
			<f:selectItem itemLabel="16" itemValue="16"/>
			<f:selectItem itemLabel="17" itemValue="17"/>
			<f:selectItem itemLabel="18" itemValue="18"/>
			<f:selectItem itemLabel="19" itemValue="19"/>
			<f:selectItem itemLabel="20" itemValue="20"/>
			<f:selectItem itemLabel="21" itemValue="21"/>
			<f:selectItem itemLabel="22" itemValue="22"/>
		</h:selectOneMenu>	
		:
		<h:selectOneMenu id="minutoinicio" style="width: 47px" value="#{bAloca.minutoinicio}" styleClass="input_text">
			<f:selectItem itemLabel="00" itemValue="00"/>
			<f:selectItem itemLabel="10" itemValue="10"/>
			<f:selectItem itemLabel="20" itemValue="20"/>
			<f:selectItem itemLabel="30" itemValue="30"/>
			<f:selectItem itemLabel="40" itemValue="40"/>
			<f:selectItem itemLabel="50" itemValue="50"/>
		</h:selectOneMenu>
		
		<h:outputText value="Hora Final: " styleClass="paragrafo" />
		<h:selectOneMenu id="horafim" style="width: 47px" value="#{bAloca.horafim}" styleClass="input_text">
			<f:selectItem itemLabel="08" itemValue="08"/>
			<f:selectItem itemLabel="09" itemValue="09"/>
			<f:selectItem itemLabel="10" itemValue="10"/>
			<f:selectItem itemLabel="11" itemValue="11"/>
			<f:selectItem itemLabel="12" itemValue="12"/>
			<f:selectItem itemLabel="13" itemValue="13"/>
			<f:selectItem itemLabel="14" itemValue="14"/>
			<f:selectItem itemLabel="15" itemValue="15"/>
			<f:selectItem itemLabel="16" itemValue="16"/>
			<f:selectItem itemLabel="17" itemValue="17"/>
			<f:selectItem itemLabel="18" itemValue="18"/>
			<f:selectItem itemLabel="19" itemValue="19"/>
			<f:selectItem itemLabel="20" itemValue="20"/>
			<f:selectItem itemLabel="21" itemValue="21"/>
			<f:selectItem itemLabel="22" itemValue="22"/>
		</h:selectOneMenu>	
		:
		<h:selectOneMenu id="minutofim" style="width: 47px" value="#{bAloca.minutofim}" styleClass="input_text">
			<f:selectItem itemLabel="00" itemValue="00"/>	
			<f:selectItem itemLabel="10" itemValue="10"/>
			<f:selectItem itemLabel="20" itemValue="20"/>
			<f:selectItem itemLabel="30" itemValue="30"/>
			<f:selectItem itemLabel="40" itemValue="40"/>
			<f:selectItem itemLabel="50" itemValue="50"/>
		</h:selectOneMenu>
		
		<br /><br />
		
		<h:outputText value="Dia da Semana: "/>
		<h:selectOneMenu id="diasemana" style="width: 157px" value="#{bAloca.diasemana}" styleClass="input_text">
			<f:selectItem itemLabel="SEGUNDA" itemValue="1-SEGUNDA"/>
			<f:selectItem itemLabel="TERCA" itemValue="2-TERCA"/>
			<f:selectItem itemLabel="QUARTA" itemValue="3-QUARTA"/>
			<f:selectItem itemLabel="QUINTA" itemValue="4-QUINTA"/>
			<f:selectItem itemLabel="SEXTA" itemValue="5-SEXTA"/>
			<f:selectItem itemLabel="SABADO" itemValue="6-SABADO"/>
		</h:selectOneMenu>	
		
	    <h:outputText value="Quantidade: " styleClass="paragrafo" />
		<h:inputText value="#{bAloca.quantidade}" styleClass="input_text" />
		
		<br />
		<div class="finalizar">
		
		
		<h:commandButton value="Pesquisar" actionListener="#{bAloca.salasdisponiveis}" styleClass="botao" />
		
		<br /><br /> 
		
		<a href="principal.faces" class="link_geral">Retornar para a Tela Principal</a>
		</div>
		
		<br />
		
		<div class="erro"><h:outputLabel value="#{bAloca.mensagem}" style="color: red"/></div>
		
		<br />
		<rich:tabPanel id="clientTabPanel" switchType="client">
		    <rich:tab id="clientFirst" label="Lista de salas disponíveis">
            <rich:dataTable border="1" id="salas" value="#{bAloca.listaSalaDisponivel}" var="salas" headerClass="tabela">
		
			<h:column id="codsala"> 
			
				<h:outputText value="#{salas.id.codSala}"></h:outputText>
				
				<f:facet name="header">
					<h:outputText value="Cod. Sala"></h:outputText>
				</f:facet>
			</h:column>
			<h:column id="dscsala"> 
			
				<h:outputText value="#{salas.dscSala}"></h:outputText>
				
				<f:facet name="header">
					<h:outputText value="Desc. Sala"></h:outputText>
				</f:facet>
			</h:column>
			<h:column id="codbloco">
			
				<h:outputText value="#{salas.id.codBloco}"></h:outputText>
				
				<f:facet name="header">
					<h:outputText value="Bloco"></h:outputText>
				</f:facet>
			</h:column>
			<h:column id="codpavimento">
			
				<h:outputText value="#{salas.id.codPavimento}"></h:outputText>
				
				<f:facet name="header">
					<h:outputText value="Pavimento"></h:outputText>
				</f:facet>
			</h:column>
			<h:column id="capacidade">
				<h:outputText value="#{salas.capacidade}"></h:outputText>
				<f:facet name="header">
					<h:outputText value="Capacidade"></h:outputText>
				</f:facet>
			</h:column>
			<h:column id="arcondicionado">
				<h:outputText value="#{salas.arCondicionado}"></h:outputText>
				<f:facet name="header">
					<h:outputText value="Ar cond."></h:outputText>
				</f:facet>
			</h:column>
			<h:column id="ventilador">
				<h:outputText value="#{salas.ventilador}"></h:outputText>
				<f:facet name="header">
					<h:outputText value="Ventilador"></h:outputText>
				</f:facet>
			</h:column>
			<h:column id="tipoquadro">
				<h:outputText value="#{salas.tipoQuadro}"></h:outputText>
				<f:facet name="header">
					<h:outputText value="Quadro"></h:outputText>
				</f:facet>
			</h:column>
			<h:column id="reservar">
				<f:facet name="header">
					<h:outputText value="Reservar"></h:outputText>
				</f:facet>
				<h:commandLink actionListener="#{bAloca.confirmaAloca}" styleClass="link_geral">
					<h:outputText value="Reservar"></h:outputText>
				<f:param id="pcodsala" value="#{salas.id.codSala}" />
				<f:param id="pcodcampus" value="#{salas.id.codCampus}" />
				<f:param id="pcodbloco" value="#{salas.id.codBloco}" />
				<f:param id="pcodpavimento" value="#{salas.id.codPavimento}" />
				</h:commandLink>
			</h:column>
		</rich:dataTable>
        </rich:tab>
        <rich:tab id="clientSecond" label="Alocações à salvar">
          <rich:dataTable border="1" id="turmasalocadas" value="#{bAloca.listaAlocacoes}" var="alocacoes" headerClass="tabela">
			<h:column id="coddasala">
				<f:facet name="header">
					<h:outputText value="Sala"></h:outputText>
				</f:facet>
				<h:outputText value="#{alocacoes.id.codSala}"></h:outputText>
			</h:column>
			<h:column id="coddobloco">
				<f:facet name="header">
					<h:outputText value="Bloco"></h:outputText>
				</f:facet>
				<h:outputText value="#{alocacoes.id.codBloco}"></h:outputText>
			</h:column>
			<h:column id="coddocampus">
				<f:facet name="header">
					<h:outputText value="Campus"></h:outputText>
				</f:facet>
				<h:outputText value="#{alocacoes.id.codCampus}"></h:outputText>
			</h:column>
			<h:column id="coddaturma">
				<f:facet name="header">
					<h:outputText value="Turma"></h:outputText>
				</f:facet>
				<h:outputText value="#{alocacoes.id.codTurma}"></h:outputText>
			</h:column>
			<h:column id="diaSemana">
				<f:facet name="header">
					<h:outputText value="Dia da Semana"></h:outputText>
				</f:facet>
				<h:outputText value="#{alocacoes.id.diaSemana}"></h:outputText>
			</h:column>
			<h:column id="horainicio">
				<f:facet name="header">
					<h:outputText value="Início da Aula"></h:outputText>
				</f:facet>
				<h:outputText value="#{alocacoes.id.horaInicio}"></h:outputText>
			</h:column>
			<h:column id="horafim">
				<f:facet name="header">
					<h:outputText value="Término da Aula"></h:outputText>
				</f:facet>
				<h:outputText value="#{alocacoes.id.horaFim}"></h:outputText>
			</h:column>
			
			<h:column id="deletar">
				<f:facet name="header">
					<h:outputText value="Deletar"></h:outputText>
				</f:facet>
				<h:commandLink actionListener="#{bAloca.dadosDeletarAlocacoes}" styleClass="link_geral">
					<h:outputText value="Deletar"></h:outputText>
				<f:param id="pdcodcampus" value="#{alocacoes.id.codCampus}"/>
				<f:param id="pdcodbloco" value="#{alocacoes.id.codBloco}"/>
				<f:param id="pdcodpavimento" value="#{alocacoes.id.codPavimento}"/>
				<f:param id="pdcodsala" value="#{alocacoes.id.codSala}"/>
				<f:param id="pdcodturma" value="#{alocacoes.id.codTurma}"/>
				<f:param id="pdhorainicio" value="#{alocacoes.id.horaInicio}"/>
				<f:param id="pdhorafim" value="#{alocacoes.id.horaFim}"/>
				<f:param id="pddiasemana" value="#{alocacoes.id.diaSemana}"/>	
				
				</h:commandLink>
			</h:column>
		</rich:dataTable>
		<center><h:commandButton action="#{bAloca.cadastraAloca}" value="Salvar" type="submit" styleClass="botao">
		</h:commandButton></center>
        </rich:tab>
        </rich:tabPanel>
		
	</h:form>
	</f:view>
<br />
	<div id="direitos">
Melhor visualizado no Internet Explorer 6.0 ou superior na resolução 1024 x 768px<br />2008©NINFO - Núcleo de Informática da Universidade Iguaçu
	</div>
	
</body>
</html>

Se alguem puder me ajudar…

<%@taglib uri=“http://richfaces.org/a4j” prefix=“a4j”%>

deve estar faltando esta tag.

Opa!
Obrigado por responder!
Mas eu tbm já havia tentado esta tag e nada…
Isso é mto estanho, pois tudo aparentemente funciona e não sei onde isso pode agravar minha página web futuramente.
Vlw!