Movieclip fade in and out using setintervals

programming flash
1

Any one help ive create a flv player, and i want the controls (controlContainer) to fade in/out when the mouse is detected out of the flv player. i know you can do this using set intervals or set timeout.

this is as far as i got, can any one help, thankyou

function checkBounds(dx, dy){

if (checkX(dx) || checkY(dy)){
    controlContainer._visible = false;
    } else {
 
    controlContainer._visible = true;
}

}

function checkX(dx) {
var Xmax = _root._width - 8;

if ((dx>1)&&(dx<Xmax)) {
    
    return false;

} else {
    
    return true;
   
}

}
function checkY(dy) {
var Ymax = _root._height - 5;

if ((dy>1)&&(dy<Ymax)) {
    return false;
    
} else {
    return true;
    /
}

}
_root.onMouseMove = function() {

_root.checkBounds(_xmouse, _ymouse);