I have a mc that fades when you mouse over it. trouble is, it fades when you move the mouse over other parts of the stage. i only want it to fade if the mouse is over the mc. any ideas? here is my code for fading:

Actionscript:
onClipEvent(load) {
//Makes variable to store inertia.
_root.mosx = 0;
//Makes variable to store inertia.
_root.mosy = 0;
_root.inertia = 5;
_root.ratioX = 206/100;
_root.ratioY = 138/100;
}
onClipEvent(enterFrame) {
//Takes '_root.mosx' and subtracts by the _xmouse mouse position to yield the difference.
_root.difx = _root.mosx - _root.fader._xmouse;
//Takes '_root.mosy' and subtracts by the _ymouse mouse position to yield the difference.
_root.dify = _root.mosy - _root.fader._ymouse;
//Subtracts the total of the _xmouse position and '_root.mosx' and _root.inertia determines the speed of the effect.
_root.mosx -= _root.difx / _root.inertia;
//Subtracts the total of the _ymouse position and '_root.mosy' and _root.inertia determines the speed of the effect.
_root.mosy -= _root.dify / _root.inertia;
//Used to control the _alpha setting of 'graphic1' with dependency of the mouse position and inertia.
_root.fader.graphic1._alpha = (_root.mosx / _root.ratioX) - (_root.mosy / _root.ratioY);
//Used to control the _alpha setting of 'graphic2' with dependency of the mouse position and inertia.
_root.fader.graphic2._alpha = 100 - (_root.mosx / _root.ratioX) - (_root.mosy / _root.ratioY);
//Used to control the _alpha setting of 'graphic3' with dependency of the mouse position and inertia.
_root.fader.graphic3._alpha = (_root.mosy / _root.ratioY) - 100 + (_root.mosx / _root.ratioX);
//Used to control the _alpha setting of 'graphic_root.ratio' with dependency of the mouse position and inertia.
_root.fader.graphic4._alpha = (_root.mosy / _root.ratioY) - (_root.mosx / _root.ratioX);
}