Loading random pictures

i know this code loads movies dynamically:

*choice = Math.round(Math.random()3);
switch (choice) {
case 0 :
target.loadMovie(“image0.swf”);
break;
case 1 :
target.loadMovie(“image1.swf”);
break;
case 2 :
target.loadMovie(“image2.swf”);
break;
}

but how would you load movies that are already imported in the library???

How, as in what function? If so, attachMovie();