Making Mouse Cursor Disappear onRollOut

Hi, I have this object and I have the following code for it:

klammer_knapp.onRollOut = function  () {;
 mus._visible = false;
 klammer_01._visible = false;
 klammer_02._visible = false;

I want the custom mouse cursor I have to disappear when I rollOut. The mouse cursor is called 'mus. When I drag out of the object, the cursor stays on the object and my actual mouse moves out. How do I just make the cursor disappear? I tried mus._visible = false but
that didn’t work. Any suggestions would be appreciated.

Also, the onRollOver event stops when the movie loops. How would I make it carry over the event as the movie loops?