simple preloader

I am trying to add a preloader to my flash site. The preloader works fine and the site appears to load fine. However, none of my buttons work. Without the preloader everything works fine. I have tried putting the preloader on the same layer as my main movie and even telling it to start with the name of the frame of my movie. Nothing seems to work. I have tried giving it a separate layer but with the same name as my first main frame. Here is the site where I got the tutorial for the preloader

http://www.ehow.com/how_2001256_add-preloader-flash-document.html

Maybe someone can help me. This is really frustrating because it takes my site a second to load so I really need a preloader.