ActionScript 3.0

Hey, looking for some help with Flash's ActionScript... I'm looking for a way to make my application randomly select a frame in a scene in which it uses "gotoAndPlay" to another scene...

For example:

Scene 2 is 500 frames long... i make a random number from 100-500 and it comes up with say: 350, so on the 350th frame on the scene it jumps onto scene 3.

i have no idea whatsoever on how to go about doing it... except for making the int with random: [Math.round(Math.random() * 400 + 100;]

I know this is kind of not programing, but I don't know where else i could get an answer on the subject :/

>>20
I'm actually not even visiting anything on 4chan anymore besides /g/ /v/ and /comp/... not like I expect you to be familiar with any other boards besides /b/ and this shithole
i hope you get cancer
As always, the belief that being familiar with any imageboards at all is something to be proud of goes hand in hand with a predictable behaviour we all know too well, sadly.

Back to /g/, /v/ and /comp/, please.