Ok here is my code from my MasterPage so far:

VB Code:
  1. Partial Class Header

  2.     Inherits System.Web.UI.MasterPage

  3.  
  4.     Private mLanguage As String

  5.     Private mDirective As String

  6.  
  7.     Public Property Directive() As String

  8.         Get

  9.             Return mDirective

  10.         End Get

  11.         Set(ByVal value As String)

  12.             mDirective = value

  13.         End Set

  14.     End Property

  15.  
  16.     Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init

  17.         Select Case Me.Directive

  18.             Case "Products"

  19.                 Products.ImageUrl = "images/new_header/Menu_Items/Products_On.jpg"

  20.             Case "About"

  21.                 About.ImageUrl = "images/new_header/Menu_Items/AboutUs_On.jpg"

  22.             Case "Search"

  23.                 Search.ImageUrl = "images/new_header/Menu_Items/Search_On.jpg"

  24.             Case "Employment"

  25.                 Employment.ImageUrl = "images/new_header/Menu_Items/Employment_On.jpg"

  26.             Case "Contact"

  27.                 Contact.ImageUrl = "images/new_header/Menu_Items/Contact_On.jpg"

  28.         End Select

  29.  
  30.     End Sub

  31. End Class

When my contentpage PreInit event fires, I would like it to change the Directive property of the MasterPage, but I'm not sure how to expose it from the contentpage.