How do u make a curser that you've made look different when u roll over a button

how do u make a curser that you’ve made yourself look different when u roll over

this is what i have:

a movie clip called CurserNew_mc and then a blank frame with the actions

Mouse.hide()
startDrag(cursernew,true)

‘WHAT’ do i do to make it different when i roll over a button?