fix shifted image button in firefox
fix shifted image button in firefox

Amadren/diaspora,geraspora/diaspora,Muhannes/diaspora,SuperTux88/diaspora,diaspora/diaspora,Muhannes/diaspora,SuperTux88/diaspora,jhass/diaspora,spixi/diaspora,diaspora/diaspora,Flaburgan/diaspora,spixi/diaspora,Flaburgan/diaspora,jhass/diaspora,KentShikama/diaspora,geraspora/diaspora,geraspora/diaspora,Amadren/diaspora,diaspora/diaspora,geraspora/diaspora,Amadren/diaspora,KentShikama/diaspora,spixi/diaspora,despora/diaspora,Amadren/diaspora,despora/diaspora,despora/diaspora,KentShikama/diaspora,diaspora/diaspora,despora/diaspora,Muhannes/diaspora,SuperTux88/diaspora,Flaburgan/diaspora,Muhannes/diaspora,KentShikama/diaspora,jhass/diaspora,spixi/diaspora,jhass/diaspora,Flaburgan/diaspora,SuperTux88/diaspora