Flash HTML5画布 - 在鼠标悬停时从另一个MC定位一个MC

I am experimenting a bit with Html5 canvas in Flash using the codesnippet embedded in the program. But I cant get the mouseover function to work. I have two MCs on my stage and trying to hide MC2 when mouseover on MC1.... pretty simple I would think. I have this code but its not working, what am I doing wrong?... and what does the variable "freaquency" do, and is it required?I am experimenting a bit with Html5 canvas in F