loadMovie(clip) question re: stuff underneath

Hi all!

When my site is first launched by the user an intro screen appears with directions on how to use the site. I gave it a semi-transparent background so that the user can see the site layout (buttons and stuff to play with) underneath the instructions. Then the user can close the window and go to it.

My question is - is there a way to keep the user from being able to access any of the buttons etc. until they first close the intrusction screen? Right now the instruction screen is just a movie clip that gets loaded when the site is launched (sitting on the main screen) and one can roll over etc. anything underneath it. I have tried to work with loading the movie clip onto a level 1 but I can’t get it to work.

Any suggestions? Thanks much!