// define a var down to false
var down = false;

// if down equals false and the mouse is over the div hit_area, slide the menu down
function toggleDown() {
if(down==false){
down=true;
t1 = new Tween(document.getElementById('menu_holder').style, 'top', Tween.strongEaseOut, -58, 0, .6, 'px');
t1.start();
}
}

// if down equals true and the mouse is over the div hit_area2, slide the menu up
function toggleUp() {
if(down==true){
down=false;
t1 = new Tween(document.getElementById('menu_holder').style, 'top', Tween.strongEaseIn, 0, -58, .4, 'px');
t1.start();
}
}