Looks like this will work:
1) go to the last frame (Frame x)
2) put the mouse over the frame key itself and with a right mouse click ...choose Action and enter the two lines of code
the first line is to stop the Movie and the second line is to get the domain name ou want
don't forget to change domain.com with your URL
Code:
stop();
getURL("http://www.domain.com", "_self");
I snagged this from another site I found with google.