The problem is that you are triggering a mousemove event _every_ time
you move the mouse within the <div>, and every single time you create
a Move effect.
So when you leave the <div> there is a mouseout event and also the
mousemove event from your last mouse movement.

The flickering you see is the interference of the two created move
effects. Since script.aculo.us renders all ongoing effects "in
parallel", unless you specify otherwise.

As a workaround you could use an extra Event.Queue for your menu, and
limit the effects in the queue to only one at a time.
This is a bit dirty, but it works sort of. Of course you can mess
things up if you move your mouse very fast (depending on the effects
duration) in and out of the <div>.

It maybe better to save the state of the "menue" somewhere and check
that before creating a new effect.

<html>
  <head>
    <script type="text/javascript" src="prototype.js"></script>
    <script type="text/javascript" src="effects.js"></script>
    <script type="text/javascript">
      document.observe("dom:loaded", function(ev) {
        $('aeusseresmenue').observe('mouseover', function(ev) {
          new Effect.Move(this, {x:0, y:50, duration:0.2, mode:
"absolute", queue : {scope : 'myscope', limit : 1}});
        });
        $('aeusseresmenue').observe('mouseout', function(ev) {
          new Effect.Move(this,{x:-200, y:50, duration:0.2, mode:
"absolute", queue : {scope : 'myscope', limit : 1}});
        });
      });
    </script>
  </head>
  <body>
    <div id="aeusseresmenue" style="background: #0c0; width: 230px;
height: 400px; position: absolute; left: -200px; top: 50px;">
      <div id="inneresmenue" style="background: #000; width: 200px;
height: 400px;">
        Hallo Welt
      </div>
    </div>
  </body>
</html>

On 13 Feb., 17:20, Mario <sevenartwo...@googlemail.com> wrote:
> Hi there,
>
> I'd like to move a <div> container which is mostly hidden left of the
> screen (width is 230px, left is -200px so you can only see the right
> border) into the screen and back by using the event handlers
> onmouseover and onmouseout.
>
> It works already but not perfect: By leaving the <div> box the
> container shortly flickers in the middle again for some mili seconds.
> Can anybody help me?
>
> <body>
>
> <div id="aeusseresmenue" style="background: #0c0; width: 230px;
> height: 400px; position: absolute; left: -200px; top: 50px;"
> onmousemove='new Effect.Move(this,{x:0, y:50, duration:0.2, mode:
> "absolute"});' onmouseout='new Effect.Move(this,{x:-200, y:50,
> duration:0.2, mode: "absolute"});'>
> <div id="inneresmenue" style="background: #000; width: 200px; height:
> 400px;">
> Hallo Welt
> </div>
> </div>
>
> </body>
>
> Thanks, Mario.
>
> PS: I already tried to use onmouseover instead of onmousemove, but
> then i had the problem of recalling the move in all the time.

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