[Seaside] Scriptaculous and Move

[Squeaker]

Greetings All,

I am trying to use the Move Effect in Scriptaculous.  Here is my simple 
test code:

renderContentOn: html
   html div
     id: 'testMove';
     onClick: (html effect id:'testMove'; duration: 1; move: 10 at 10);
     with: [html text: 'this is a test'].


When I run this, the javascript for the move effect is executed (I have 
a breakpoint to prove it) but the element does not move.

I have tried the other effects, e.g., "scale" and it works but "move" 
appears to do nothing.

What am I doing wrong?

Thanks,
Frank