Turning a string into an equation

1

I while ago I asked how one would turn a string into an equation. I decided to just make something myself.

Here is the source code: http://www.steven-s.us/upload/store2/StringToEquation.fla

And here is the swf: http://www.steven-s.us/upload/store2/StringToEquation.swf

The only problem is, I was too lazy to include things like powers, sins, cosines, and perenthesis.