Controlling windows

whats up everyone… kinda cold here in ny…
I have a question. I have an html splash page and when you press the play intro button, a pop-up window appears and you can play a flash intro. When the intro is finished playing, I would like the pop-up window to disappear and the html splash page to change into one of my inside pages. I have been asking this question so many times but no one seems to answer me. Is it that hard??
thanks
omar