Updating Master page header variable from topic

Hi,

I'm using Robohelp 8 and have the following issue.  I have one master page for my project.  I'm trying to put a placeholder/variable in the master page header.  This variable needs to be updated from each HTML topic. Is there a way to do that?

Example:

department1.htm

• dep1Page1.htm - header should read "Department1"
• dep1Page2.htm - header should read "Department1"
• dep1Page3.htm - header should read "Department1"

department2.htm

• dep2Page1.htm - header should read "Department2"
• dep2Page2.htm - header should read "Department2"
• and so on

department3.htm

• and so on