Help with this preloader thingy please

Ok, I finall got the little circly thing to work… by accident and not exactly the way i want it, but I like it. And now I need to figure out how to make both sides fill up as the page loads. I was thinking about just having the size of an instant flat, then have it rise as the page loaded, but I want it to be like the speedometer in racing games. Know what I mean?

here’s the fla

if half of it can be done, cant I just do the other half upside down? I want both sides to fill up, kinda like a yin yang thing.