fixed IE6's JS error
fixed the scrollbar issue for Mac's safari for B50-3354057.zul, B50-3357475.zul, B50-ZK-241.zul, B50-ZK-309.zul, and B50-ZK-489.zul
fixed IE 6 issue for Groupbox's test cases. (like B50-3356022.zul)
Merge remote-tracking branch 'upstream/6.5'