Javascript Quadratic Equation Calculator

Quadratic Equation Calculator 0 = ax2 + bx + c. Enter a, b, and c to solve for x.
a:	b:	c:
	x = or

I'm rather proud of this. I'm just starting to teach myself javascript, and this is my first script that actually does something. If there's any critique, I'd love to hear it. Even better, if there are suggestions for further beginner projects, I'd love even more to hear them.