Scrollbar Tutorial, Source isn't Functioning

Hello, I just downloaded the source .fla from a text scrollbar tutorial at the following URL:
But it doesn’t seem to work for me when I open it on my computer and try exporting the .swf. I’ve noticed this problem before when doing another tutorial … basically, everything seems like it’s working except the draggable scrollbar doesn’t appear.
I’m sure there’s a perfectly simple explanation for this, but I’m kind of a newb with flash. Anyhow, please help. Thanks.