builder css fixes: 3841 & 3448

[Valles, Heidi]

hi all,

I've added a css patch for the builder to fix some focus & hover issues on FF & IE: 
http://issues.fluidproject.org/browse/FLUID-3841

I've also added a patch to remove background images for the builder's buttons, solving some broken looking probs on IE & IE6's opacity issues:
http://issues.fluidproject.org/browse/FLUID-3448

cheers,
heidi


Heidi Valles
Accessible Software Developer
Inclusive Design Research Centre, OCAD University