flash help

[.::nØ燎ƒµEL::.]

ok, i have Macromedia Flash 8 and im getting involved in stupid games programming, using actionScript, of course!!

here's the question; i know that creating a movieclip and adding the code

onClipEvent (enterFrame) {
_y=_root._ymouse;
_x=_root._xmouse;
}

to it, makes the image move as you move the mouse inside the flash window.

i want to know how to make the arrow disappear , because with the code said before the arrow is still showing and the upper left corner of the movieclip is used as anchoring point