[Moo] long fade out

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How to make a long fade out and fade in.
I have the follwing code. It does everything without fading


window.addEvent('domready', function()
{

var path = 'http://www.opteynde.com/';
var writehere = $('jsonText');

writehere.set('tween', {duration: '200000000'});
writehere.tween('opacity', 0); //fade out

//writehere.fade('out');

var request = new Request.JSON(
{
  url: path + 'ask.php',
  onComplete: function(htmlText)  {
  writehere.set('html', htmlText).tween('opacity', 100);  //löscht
vorhandenes  und trägt neues ein.
  }
}).send();

});