prevent auto submit

[sa sam]

i am using popup panel using jsf/icefaces.

i am using user add page in popup panel using tag lib.
i have button called "New User", when i click this button a popup panel get visible but when i click on close button whhich means visibility of panel set to false, the page shows me required messages which i set for new user page.

can any one told me how to hide and visible panel without required message error.

<ice:commandLink actionListener="#{dashboard.hide}" value="New User"/> 
     	
     		<ice:panelPopup visible="#{dashboard.popupStatus}">
				<f:facet name="header">
			        <ice:panelGroup styleClass="popupHeaderWrapper">
			            <ice:outputText value="New User" styleClass="popupHeaderText"/>
			            <ice:commandButton id="modalPnlCloseBtn" type="button" value="X"
			            		actionListener="#{dashboard.hide}" styleClass="popupHeaderImage"/>
			    	</ice:panelGroup>
			    </f:facet>
			    <f:facet name="body">
			        <ice:panelGroup styleClass="popupBody">
			            [b]<ft:newUser/>[/b]
			        </ice:panelGroup>
			    </f:facet>
			</ice:panelPopup>

newUser.jspx -

<span xmlns:ice="http://www.icesoft.com/icefaces/component"
	  xmlns:f="http://java.sun.com/jsf/core"
	  xmlns:h="http://java.sun.com/jsf/html">

		<table  >
 			<tr>
 				<td> <ice:outputLabel value="Valid Email * :"/> </td>
 				<td> <h:inputText id="email_id" value="#{newUser.userName}" required="true"    requiredMessage="Username Required" styleClass="input_box">
 						<f:validator validatorId="dataValidator"/>
 					 </h:inputText>
 				</td>						
 			</tr>
 			<tr>
 				 <td></td> <td ><h:message for="email_id" styleClass="error_messages"/></td>
 			</tr>
 			
 			<tr>
 				<td> <ice:outputLabel value="First Name * :"/> </td>
 				<td> <h:inputText id="firstName" value="#{newUser.firstName}" required="true" requiredMessage="First Name Required" styleClass="input_box">
 						<f:validator validatorId="dataValidator"/>
 					 </h:inputText>
 				</td>
 			</tr>
 			<tr>
 				<td></td> <td ><h:message for="firstName" styleClass="error_messages"/></td>
 			</tr>
 			
 			<tr >
 				<td  >
 					<ice:commandButton value="Submit" type="submit" styleClass="button" actionListener="#{newUser.processNewUser}"/>
 					<ice:commandButton value="Clear" styleClass="button" type="reset"/>					
 				</td>
 			</tr>													
 		</table>
</span>