My designers almost deny to make slices compatible to IE6.
Even at the delivery, I suggest the customer that it is error free on Firefox. If you are not using it already, please download and use it. 9 out of 10 small projects go smoothly in this manner.
I would rather discuss on what is best way to deal this scene? How do you deliver slicing projects? And, is it good to ask customers upgrade their browses? And what about the customers of our customers, whom we do not talk directly?