loading a variable number of external .jpg's

[user]

hi,

I got a problem:

I want to create an image gallery that loads external jpg's from a
folder. then navigate from one to the next with a simple button:

on (press) {
n = n+1;
main.container.loadMovie("image/"+n+".jpg");
}

so far so good, but since I do have sometimes more, somtimes less images
in the folder, I don' know how to jump to the first image if there is no
more image ...

should not be complicated?

thanks, philippe