How can I make a menu inside an iframe influence information outside the iframe?

[Martinricky]

Using Dreamweaver, I've created a menu called menu.html in an iframe which is in turn in a parent document called index.html. However, when I click on any item within the menu, I'm only able to influence the document inside and not outside the iframe. I'm unable to achieve interaction between menu.html and index.ht. Can anyone help with a simple set of instructions?