How can I use 1 JSP for edit/create functionality?

Hi All,
Does anybody have an example of using one JSP for both editing and creating an object? I am pretty sure I can handle most of it, but am not sure about how I can specify different messages from the resource bundle (i.e. modifying the screen title for the different uses, "New Campaign" vs. "Edit Campaign").
My background is in PHP and DHTML (i.e. more front-end) and I'm just starting with Java and JSF. As such, I want to be sure that I'm using appropriate patterns for my programming.
Thank you in advance for any help,
Matt

I make the difference between modifying an existing object and a new one by the ID in the object. Each object has a unique ID in my app assigned by the database. So if the ID is 0, the user is creating a new object, not stored in the DB yet. I store the object to be edited/modified in the session before displaying the page:
For the title:
<h:outputText value="Edit Material" rendered="#{sessionScope.selectedMaterial.materialId != 0}"/>
<h:outputText value="New Material" rendered="#{sessionScope.selectedMaterial.materialId == 0}"/>For the action buttons:
<h:commandButton value="Update Material" action="#{MaterialControllerBean.updateMaterial}" rendered="#{sessionScope.selectedMaterial.materialId != 0}"/>
<h:commandButton value="Create Material" action="#{MaterialControllerBean.createMaterial}" rendered="#{sessionScope.selectedMaterial.materialId == 0}"/>

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