How do I assign to Page to MasterPage

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SharePoint2010

Hi All,
am using sharepoint server2010 and Sharepoint desiner.

I want to assign two Different Asp Page into the "div" tag on my master Page.

suppose I have
1. HomePage
2. myPage

I have a table on my masterPage , and I divide this table tow different rows and cells,
and I want to assign in first cell the home Page , and in second cell the myPage .

when I do this using the contentPlaceHolder,
for the first cell (home page it's ok) but for the second Cell(myPage) it show me no thing.

I may think the problem is with
1. I just imagine that the Master-page already know the Home-page by setting it as "Home-Page" while the other page is do nothing.

2.and the second think my I don't know how to Use "ContentPlaceHolder" perfectly , I use it like this
a.<asp:ContentPlaceHolder ID="ContentPlaceHolderMain" runat="server">
b.<asp:ContentPlaceHolder ID="ContentPlaceHolderMypage" runat="server"
and then I take this ContentPlaceHolder and put it in the top of the Page which I want


So could you please help to assign different asp page to different "div" in master Page.

thanks all .