Is is possible to use shimano 10 spped cassette with Campy shifters and derailleurs? Thanks.

...yes, it is possible. Because the spacing is different, the shifting will work, but may get noisy/sloppy at the extremes.

It will work, but not that good on your smallest and largest gears. You will have about a
20% chain alignment error.

You have two solutions. Purchase a aftermarket cassette with different tooth spacing or cable pull shifting converter http://www.jtekengineering.com/shiftmate.htm