Help with passing movieclip parameters

I have a movieclip (menu1_mc) on my root timeline. (There will be 3 of these movieclips so I want to use the same functions to control their properties)
For simplification, I am only showing 2 mouse events for one movieclip, over and out.

menu1_mc.addEventListener(MouseEvent.MOUSE_OVER,isActive);
menu1_mc.addEventListener(MouseEvent.MOUSE_OUT,notActive);
function isActive(evt:Event):void
{
trace(evt.target.name); // menu1_mc
trace(typeof(evt.target.name)); // String
evt.target.name.x=300; // error “Cannot create property x on String.”
evt.target.name.y=0;// error “Cannot create property y on String.”
}
function notActive(evt:Event):void
{
trace(evt.target.name); // menu1_mc
trace(typeof(evt.target.name)); // String
evt.target.name.x=30; // error “Cannot create property x on String.”
evt.target.name.y=0; // error “Cannot create property y on String.”
}

I could sure use some help getting this to work.

TIA.