jstl中的判断list中是否包含某个值

<a id="aHref_${device[0]}" onclick="addSelectDeviceId(${device[0]})">
	<c:set var="iscontain" value="false" />  
	<c:forEach items="${sessionScope.SelectDeviceIdsList}" var="map">
				<c:if test="${map.key eq device[0]}">     
	<c:set var="iscontain" value="true" />  
 </c:if> 
	</c:forEach>
																
		<c:if test="${iscontain}">
		<img id="sign_${device[0]}" name="sign_${device[0]}"  
			 src="images/expantion/ok_sign.png"/>
	<span style="white-space:pre">	</span></c:if>
																	
	<c:if test="${!iscontain}">
			<img id="sign_${device[0]}" name="sign_${device[0]}"  
						src="images/expantion/add_sign.png"/>
	</c:if>
</a>