flash template 9 linking problem

Hi Guys !

Sorry for my bad English ! I'm French !
I'm working on http://www.freenicetemplates.com/fre...template/9.htm which I find beautiful but not easy to customize !!
I just created new pages but I can't "link" them to the first page. I explain : when I click on "My Portfolio" in the home page nothing happens ! It means my own Portfolio page does NOT open :-(
This page is named : _portfolio.htm and is in the same folder (on my computer) as Home page, so it should work !
I have been searching what is not going on, but I can't find ! Help is most welcome !
By the way (but I'm sure it has nothing to see), I'm on Mac and working with Dreamweaver.
Many, many thanks !
T.

By the way : none of the pages I created is linked ! The buttons on Home page simply don't open anything