Drag areas Question? Help!

Hey i am have a quick question, when you have a movie clip that can be drug around, how do you define its area that it can move in.

Using:

on (press) {
startDrag ("_root.yellow");
}
on (release) {
stopDrag ();
}

I just want to know how to define the area that i can be drug in…

actionscript help, USE THE HELP PANEL folks!
everything is in there!
startDrag(target,lockCenter, left, top, right, bottom); …