Trouble with Nested Master Pages.

Experts-

This doesn't seem like it will be too complicated, but it may be complicated to explain :-).  I think the root of the problem revolves around my misuse of "Master.FindControl" in combination with nested master pages.  Obviously I could be wrong.  Anyway, here it is:

My site setup looks like the following:
-Masterpage(main masterpage - contains navbar with links 1-6)
        -page1 (content to main masterpage - is displayed when link 1 is clicked)
        -page2 (content to main masterpage - is displayed when link 2 is clicked)
        -Nested Masterpage (content to main masterpage - contains navbar with links A-D)
                -page3/A (content to nested masterpage - is displayed when link 3 is click and should display when link A is clicked)
                -pageB (content to nested masterpage - should display when link B is clicked)
                -pageC (content to nested masterpage - should display when link C is clicked)
                -pageD (content to nested masterpage - should display when link D is clicked)
        -page4(content to main masterpage - is displayed when link 4 is clicked)
        -page5 (content to main masterpage - is displayed when link 5 is clicked)
        -page6 (content to main masterpage - is displayed when link 6 is clicked)

(Problem #1)
On my navbar on my main master page I have 6 <asp:LinkButton>'s, styled with CSS so that they have an image for their background (image#1), and another image on mouse hover (image#2).  When a content page is displayed, I am programatically changing the css class of the linkbutton that is assigned to the content page.  So for example, link 5 is clicked, and on the pageload of page 5, link5 on the masterpage has it's css class changed to a different class so that the image is different, making that link appear "active".  
I am using the following code on each content page to make this happen: Code Snippet #1 shown below.
This is working correctly for content pages 1-2 and 4-6.   This is not working correctly for content page 3/A, I'm assuming because the code can't determine which master page to look to for the control.

===============================================

(Problem #2)
On my navbar on my nested master page I have 4 <asp:linkbutton>'s (links A-D) using the same setup as mentioned above.  I have all my linkbuttons on my main master page set to use the same event handler, and all my linkbuttons on my nested master page set to use the same event handler.  I am using the following code example to make this happen: Code Snippet #2 shown below.  This is working fine for links 1-6 on the main masterpage.  However links A-D on the nested masterpage are not working.  An error is not being thrown, but when links A-D are clicked they opt out of the IF statement with the "else" option and direct back to my index page.  Pages A-D do load properly if I manually type their address into the URL, however the CSS class isn't changing as it should.

Thanks for the help.  Let me know if I can clarify anything.

-Pete

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/*=== Code Snippet #1 ===*/
protected void Page_Load(object sender, EventArgs e)
{
    LinkButton btHome = (LinkButton)Master.FindControl("linkEmail");
    btHome.CssClass = "navButtonActive";
}
 
 
/*=== Code Snippet #2 ===*/
protected void EmailNavigation(object sender, EventArgs e)
{
    string userClickedMe = Request["__EVENTTARGET"];
 
    string EMAIL = "ctl00$linkNewEmail",
           SCHEDULED = "ctl00$linkScheduled",
           LETTER = "ctl00$linkNewLetter",
           LIBRARY = "ctl00$linkLibrary";
 
    if (userClickedMe == EMAIL)
    {
        Response.Redirect("http://xxx.xxx.xxx.xxx/admin/NewEmail.aspx");
    }
    else if (userClickedMe == SCHEDULED)
    {
        Response.Redirect("http://xxx.xxx.xxx.xxx/admin/Scheduled.aspx");
    }
    else if (userClickedMe == LETTER)
    {
        Response.Redirect("http://xxx.xxx.xxx.xxx/admin/NewLetter.aspx");
    }
    else if (userClickedMe == LIBRARY)
    {
        Response.Redirect("http://xxx.xxx.xxx.xxx/admin/Library.aspx");
    }
    else
    {
            Response.Redirect("http://xxx.xxx.xxx.xxx/admin");
    }
}