Make script work in As3

programming flash
1

I have a script that makes a set of frames move back and forth by use of the mouse in As2
I would like to use it in As3 but couldnt figure out how to modify it. Could someone please help me make this work in As3
Thanks

stop();
onMouseMove = function() {
gotoAndStop(Math.floor(_root._ymouse*(_root._totalframes)/(_root._height)));
updateAfterEvent();
}