_xscale & _yscale increments

programming flash
1

Folks, I have a movie clip that I want the user to be able to scale up or down in increments of 10% by pressing the up and down buttons. I think I’m close, any help would be appreciated.

on (keyPress “<Up>”) {
_root.myclip._xscale (110);
_root.myclip._yscale (110);
}
on (keyPress “<Down>”) {
_root.myclip._xscale, (90);
_root.myclip._yscale, (90);
}