huge number of analysis error (using firefox)

[cbesot]

In FF (3.6), thousand errors per second appears in error console (sorry, it's in french) : "Erreur d'analyse de la valeur pour "left". Déclaration abandonée" "Erreur d'analyse de la valeur pour "top". Déclaration abandonée"

[Dartcode]

Same thing happens here on FF 4.0.1.

But it only happens when parallax layer has the exact same height (for top errors) or width (for left errors) as parallax port.

I get values such as "-234568699252828226662626.967458524562522552%" or "Nan" for top or left.

I'm not skilled enough to modify the code to add a check, so the best way I found to avoid this error spitting is to add "xparallax: false" and/or "yparallax: false" to those specific layers.