<h:form id="login">
Email: <h:inputText id="email" value="#{user.email}"/>
<h:commandLink id="signupLink" value="signup" action="#{userManager.validate}"/>
</h:form>
To something like this:
<form action="#{userManager.validate}">
Email: <input type="text" id="email" value="#{user.email}"/>
<button type="submit" value="signup"/>
</form>