As a comment on the helper functions, we could also just have something that does on the fly conversion. In other words if I say 300 pixels, I want it to translate that into EM / other unit in the background. The reason I bring that up is to allow exact PX still be used for the Flex / Air side and converted for the js/css side.
pixelTotal / fontSize = em 300 / 14 = 21.429 (rounded) Soo 300px for flex and 21.429 for JS side. -Mark K
