[OpenLayers-Dev] Problem with Firefox on Navtoolbar

[Antonio Volpicelli]

Hi devs,
I am trying to use NavToolbar Control but seems that it doesn't work 
fine on Firefox and Opera
It seems that the active area when I click is not on the arrow images.
For the UP arrow the active area is some pixels at bottom right of the 
arrow image.
For the DOWN arrow it is at top right of the arrow image
The LEFT arrows doesn't work at all
The RIGHT arrow works fine.
So I tried the live example 
http://www.openlayers.org/dev/examples/navtoolbar.html and this has the 
same problem.

It works fine with IE.

Are there someone that know why?

Thanks

Antonio