How do I go to random scene?

programming flash
1

I have a movie with 6 scenes. Upon starting I want it to start at a random scene not always the first one. I tried the code below to but I get the error :“Scene name must be quoted string”. Help please.

sceneNum = Math.floor(Math.random() * (7 - 1)) + 1;
gotoAndPlay(sceneNum, 1);