Core Effects

Opacity: change opacity.
new Effect.Opacity('opacity', {duration:5, from:1.0, to:0.1})
Scale: changes width and height dimensions and base for em units.
new Effect.Scale('scale', 120)
MoveBy: moves an element by a given x/y pair of pixels.
new Effect.Opacity('opacity', {duration:5, from:1.0, to:0.1})
Highlight: flashes a color as the background of the element.
new Effect.Highlight('highlight', {startcolor:'#ffffff', endcolor:'#ff9999'})

Parallel: combines other effects together in parallel.

new Effect.Parallel(
    [ new Effect.MoveBy('parallel', -400, 0,
        { sync: true }), 
      new Effect.Opacity('parallel', 
        { sync: true, to: 0.0, from: 1.0 } ) ],
    { duration: 5, 
      afterFinish: function(effect)
        { Element.hide('parallel'); } 
    }
  );

All take the following parameters:

Option	since	Description
duration	V1.0	Duration of the effect in seconds, given as a float. Defaults to 1.0.
fps	V1.0	Target this many frames per second. Default to 25. Can’t be higher than 100.
transition	V1.0	Sets a function that modifies the current point of the animation, which is between 0 and 1. Following transitions are supplied: Effect.Transitions.sinoidal (default), Effect.Transitions.linear, Effect.Transitions.reverse, Effect.Transitions.wobble and Effect.Transitions.flicker.
from	V1.0	Sets the starting point of the transition, a float between 0.0 and 1.0. Defaults to 0.0.
to	V1.0	Sets the end point of the transition, a float between 0.0 and 1.0. Defaults to 1.0.
sync	V1.0	Sets whether the effect should render new frames automatically (which it does by default). If true, you can render frames manually by calling the render() instance method of an effect. This is used by Effect.Parallel().
queue	V1.5	Sets queuing options. When used with a string, can be ‘front’ or ‘end’ to queue the effect in the global effects queue at the beginning or end, or a queue parameter object that can have {position:’front/end’, scope:’scope’, limit:1}. For more info on this, see Effect Queues.
direction	??	Sets the direction of the transition. Values can be either ‘top-left’, ‘top-right’, ‘bottom-left’, ‘bottom-right’ or ‘center’ (Default). Applicable only on Grow and Shrink effects.