Adding a mouse event into a script (rotator menu)

[pucca017]

I am creating a rotating menu. This is the code in each one of the 4 buttons inside the menu.

onClipEvent(load){
    y=0;
    speedR=5;
    radius=100;
    xcenter=393/2;
    ycenter=325/2;
    zcenter=100;
    angle=0;
    fl=150;
    }

    onClipEvent(enterFrame){
    _x=Math.cos(angle*Math.PI/180)*radius+xcenter;
    _y=y+ycenter;
    z=Math.sin(angle*Math.PI/180)*radius+zcenter;
    scale=fl/(fl+z);
    _xscale= _yscale = scale*100;
    angle+=speedR;
    if(angle>359){
    angle-=360;
    }

    } 

How can I add a mouse event in which slows down the speed of the button or stop the menu of moving??

Thank you